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# newton's ring experiment viva

Very useful stuff. /Count 7 These rings are known as Newton’s rings. Formula used: … … An important application of interference in thin films is the formation of Newton’s rings. Newton gave the following list of colours from the centre outwards: First order: Black, blue, white, yellow, orange, red. rays of same frequency and constant phase difference. ya,dear fellow scientists i appreciate your support and comments,so keep it up. A.Then we will have dark and bright fringes in shape of a line. A.Alternate dark and bright rings formed due to presence of air film when plano convex lens is placed on glass plate is called newtons rings. When a plano convex lens of long focal length is placed over an optically plane glass plate, a thin air film with varying thickness is enclosed between them. The microscope is moved to diametrically opposite side and the cross wire is fixed on the same ring and reading is noted. i like it ,keep it up, The knowledge is well presented and meaningful thank you, It was very useful and helped clear the concept, Thanks for this viva and the site as well, Super sir!! Theory of Newton’s Ring Circular interference fringes can be produced by enclosing a very thin film of air or any other transparent medium of varying thickness between a plane glass plate and a convex lens of a large radius of curvature. View all posts by Divya Prakash Srivastava. 3. Experiment no. 1. *1 J�� "6DTpDQ��2(���C��"��Q��D�qp�Id�߼y�͛��~k����g�}ֺ ����LX ��X��ň��g`� l �p��B�F�|،l���� ��*�?�� ����Y"1 P������\�8=W�%�Oɘ�4M�0J�"Y�2V�s�,[|��e9�2��s��e���'�9���`���2�&c�tI�@�o�|N6 (��.�sSdl-c�(2�-�y �H�_��/X������Z.\$��&\S�������M���07�#�1ؙY�r f��Yym�";�8980m-m�(�]����v�^��D���W~� ��e����mi ]�P����`/ ���u}q�|^R��,g+���\K�k)/����C_|�R����ax�8�t1C^7nfz�D����p�柇��u�\$��/�ED˦L L��[���B�@�������ٹ����ЖX�! If the waves that enter the lens are of arbitrary phase, and of all possible wavelengths Newton's rings in transmitted and reflected white light . (determination of knee voltage, zener voltage and forward resistance) … >> (4) What are Newton’s Rings ? {{{;�}�#�tp�8_\. Two salient reasons: 1. Change ), You are commenting using your Facebook account. The fall of apple inspired him to formulate the universal law of Gravitation. Newton was the first to observe the Newton’s rings Sir Isaac Newton (1642-1727): While the fall of an apple remains an ordinary phenomenon for a layman, it was not so for Newton. What do you mean by interference of light? 12.) Change ), An ongoing discussion about SAP infrastructure. A.Then the rings will be of smaller diameter and there is chance of error while taking the readings. Q.What if the glass plate is replaced with plane mirror? Intensity of fringes also depend upon the air column between lens and the base. To set up and observe Newton’s rings. �MFk����� t,:��.FW������8���c�1�L&���ӎ9�ƌa��X�:�� �r�bl1� When the two or more waves superimpose over each other, resultant intensity is modified. Popular Searches: newton raphson jacobian matrix ppt, newton raphson method matlab code iee 5 bus system, viva questions with answers for torsional pendulum experiment in physics, project report examples newton xmm, diffraction grating experiment viva questions with answers, ultrasonic interferometer experiment viva questions pdf, what is ring detect circuit in modemviva questions and … ( Log Out /  The interference is between the reflexions from twoneighboring surfaces; 2. Such fringes were first obtained by … Viva Voce for by Newton’s Ring. very good sir. Ans. Newtons Ring Experiment Viva. NEWTON’S RINGS - Q1 1) In the Newton’s ring experiment, how does interference occur? /Filter /FlateDecode The convex surface of a plano-convex lens having a long focal length (large radius of curvature) is placed in contact with a plane glass plate and clamped together. Q.What will happen if few drops of liquid is introduced between the lens and glass? The air film formed is wedge shaped locus of point of intersection is equal to the thickness of circles . EXPERIMENTAL SET UP The cross wire of the microscope is fixed at a particular dark ring, say, nth and reading is noted on microscope. A.This is so because the air film formed is wedge shaped and loci of points of equal thickness are circles concentric with point of contact. Q.What if a plane glass making some angle with the glass stripe  is used in place of lens? Newton's ring experiment 1. These procedure steps will be followed on the simulator 1. Newton’s Rings and Determination of the Wavelength of Light Newton’s Rings. Newton's Ring Experiment Procedure. The phenomenon of interference of light waves is obtained from monochromatic and coherent rays i.e. Click "Submit" button to verify the answers given, click on simulator button to skip the test and go to simulator. In this experiment, we have taken sodium lamp as the monochromatic source. Q. Tq u air thanks a lot. NEWTON’S RINGS BY REFLECTED LIGHT CONDITION OF MAXIMA: 2µt=(n+1/2)λ CONDITION OF MINIMA: 2µt=nλ 6. x���wTS��Ͻ7�P����khRH �H�. The thickness will decrease ,shape will not change, the rings will come close as diameter decreases. >> A.At the point of contact the path difference is zero but one of the rays is reflected so the effective path difference becomes  λ/2 thus the condition of minimum intensity is created hence it is a dark spot. newtons ring experiment viva questions, viva questions on carey foster bridge experiment, fresnel biprism experiment viva questionsseminar report nanotechnology 2050, newtons ring experiment viva questions with solutions pdf, bhel davr manual pdfe examination system109619solar cell experiment viva question ans, michelson interferometer experiment viva questions, viva for flywheel experiment, Indulge into some deep and suspenseful blogs here. Newton’s rings . The simulator will display the interactive questions, attempt the questions 3. Newton's rings are a fun demonstration of the wave nature of light, and also of the fact that white light is made up of many components of different wavelengths. In 1717, Sir Isaac Newton studied the rings pattern generated due to interference of light. [/ICCBased 3 0 R] 4. The global geometry of Newton’s rings. These concentric rings are known as " Newton's Rings ". Q.What will happen if we use a lens of small radius of curvature? This amazingly enough answered every question in my laboratory write up. )Travelling microscope,a sodium lamp,newtons ring apparatus,a spherometer, a cone lens of short focal length . Let’s consider a dark ring with radius r at a point where the separation is t. The right angled triangle shown in red has a height R–t so Pythagoras’ theorem gives us. A.Few colored fringes will be observed near the center. A.It turns the light rays coming from an extended source to ninety degrees and so the rays fall normally on the plano convex lens. 1 Presented by- Group 1 EE Batch 1 2. Newton's rings is an interference pattern caused by the reflection of light between two surfaces - a spherical surface and an adjacent flat surface. realli it was very awesome,very helpful in enhancing and clearing the concepts.. best website for viva ADD COMMENT 0. written 4.3 years ago by vermavarsha432 • 130: The path difference between the reflected ray and incident ray depends upon the thickness of the air gap between lens and the base. Share to Twitter Share to Facebook Share to Pinterest. What are the uses of Newton's ring experiment ? endobj Newton rings are Alternate dark and bright rings formed due to the presence of air film when the plano-convex lens is placed on the glass plate is called newtons rings. To determine the wavelength of the given source. Newtons ring experiment, Cogito Ergo Sum %PDF-1.7 A.They are formed as a result of interference between light waves reflected from the upper and lower surfaces of the air film developed between the convex surface of plano convex lens and plane glass plate. Apparatus used: A Plano convex lens of large radius of curvature, optical arrangement for Newton’s rings, plane glass plate, sodium vapour lamp and traveling microscope. A.Then we will not get interference fringe because the intensity of light reflected from mirror will be so great that it won’t be visible and we will get uniform illumination. R 2 = (R − t) 2 + r 2 which gives R 2 = R 2 − 2Rt + t 2 + r 2 and so 2Rt = t 2 + r 2. newton ring experiment viva questions wit answers Important: Use custom search function to get better results from our thousands of pages Use " " for compulsory search eg:"electronics seminar" , use -" " for filter something eg: "electronics seminar" -"/tag/" (used for exclude results from tag pages) These rings are known as Newton’s rings. Change ), You are commenting using your Twitter account. Hence, Newton’s rings are circular. ?���:��0�FB�x\$ !���i@ڐ���H���[EE1PL���⢖�V�6��QP��>�U�(j << Ans. Q.What are Newton's Rings? 2. ( Log Out /  ( Log Out /  stream ( Log Out /  /Length 2596 accha kar rahe hain. 2 0 obj 1 0 obj A.Then interference will take place but the shape of the rings will be irregular. @~ (* {d+��}�G�͋љ���ς�}W�L��\$�cGD2�Q���Z4 E@�@����� �A(�q`1���D ������`'�u�4�6pt�c�48.��`�R0��)� newtons rings • 19k views. Why the rings are circular ? Det erminat ion of t he wavelengt h of a monochromat ic source by using Newt on’s Ring experiment T he key idea behind Newt on’s Rings experiment is t he t hin f ilm f ormat ion bet ween a plane-convex lens and a glass plat e. 11.19 Refractive Index of a Liquid using Newton’s Rings 242 11.20 Newton’s Rings with Bright Centre due to Reflected Light 244 11.21 Newton’s Rings with White Light 244 11.22 Interference Filter 244 11.23 Object (Measurement of wave length of sodium light by Newton’s Rings) 245 11.24 Viva-Voce 248 12. Q.Why do rings get closer as their order increases? Change ), You are commenting using your Google account. at 19:05. Physics Lab(15PHYL17/27) Viva Questions: EXPERIMENTS: 1. The radius of curvature R of the spherical body can be determined from the radii r of the interference rings as long as the wavelength λ is known. When light is incident on such a film, a small portion gets reflected from the upper surface and a major portion is transmitted into the film. Ans: Diameter of a ring depends on the wavelength of light used, refractive index of the medium between lens and glass plate, order of the ring and radius of curvature of Planocovex lens. Due to this thin film of air a path difference occurs in the waves which reflect from the lower surface of the lens and the top surface of the glass plate. Experimental arrangement for observing Newton's rings: Let us consider a system of plano-convex lens of radius of curvature R placed on flat glass plate it is exposed to monochromatic light of wavelength λ normally. (5) Why it is necessary for the light to fall normally on plano convex lens ? I–V Characteristics of Zener Diode. �@���R�t C���X��CP�%CBH@�R����f�[�(t� C��Qh�z#0 ��Z�l�`O8�����28.����p|�O×�X Newton observed these rings when placing a spherically shaped piece of glass (a lens) touching a flat piece of glass. Q.How are Newton's rings formed? Thank you! Would the shape and the order of rings change? /Kids [42 0 R 68 0 R 94 0 R 123 0 R 156 0 R 189 0 R 220 0 R] A.They are formed as a result of interference between light waves reflected from the upper and lower surfaces of the… It is really helpful for practical examination. NEWTON’S RINGS - Q15 15) On which factors does the diameter of a ring depend? /N 3 endobj Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. View all posts by Divya Prakash Srivastava, energy, engineering, examination, experiment, information, Physics, physics lab, practicals, solar cell, viva, vivavoce, engineering, juet, newton's ring, physics, practicals, questions, viva, vivavoce. This can be seen from the formula r 2 = (m + ½) λa, (3), as r 2 α λ 1. Why Newton rings are circular in shape? They arise from the interference of light. isi chij ki to talas hai . (a) Experimental set-up (b) Newton’s rings Figure 1 In general, the path di erence between the re ected light beams which are undergoing interference (for oblique incidence) is given by = 2 tcos 2; (1) where additional path di erence of 2 is because one of the interfering beam is re ected from lm to glass surface. 1. Ans.) When the air film is … When a plano-convex lens is placed on the top of a flat glass surface a thin air film is formed between the two surfaces as shown in the figure. As the lens is symmetric along its axis, the thickness is constant along the circumference of a ring of a given radius. Sorry for my bad grammar. After going through the theory and pretest, click the "Simulation" tab 2. Ans : The path difference along the circle is constant that’s why the rings are circular in this experiment. A.The diameter of dark rings is proportional to the square root of natural numbers while bright rings are proportional to the square root of odd natural numbers hence the don’t increase at the same rate. Ans : Alternate dark and bright rings with central dark spot are called newton’s rings. When white light is used in Newton’s rings experiment the rings are coloured, generally with violet at the inner and red at the outer edge. The key idea behind Newtons ring experiment is the thin film formation between a plane-convex lens and a glass plate. 13.) /Type /Pages The thickness of the air film is zero at the point of contact and gradually increases outwards from the point of contact. The redistribution of light by superposition of light waves is called as interference. A.Alternate dark and bright rings formed due to presence of air film when plano convex lens is placed on glass plate is called newtons rings. << In this experiment Newton’s rings are investigated using monochromatic light trans-mitted through the apparatus. Labels: NEWTON’S RINGS. The experimental setup: a convex lens is placed on top of a flat surface. Thank you! Series and parallel LCR Circuits (Determination of resonant frequency and quality factor) 3. EXPERIMENT 8 To Determine the Wavelength of Sodium Light using Newton’s Rings Please read additional instructions on the bench for setting up the PC and camera for this experiment Introduction Newton’s rings are interference fringes of equal thickness which are produced in the air ﬁlm be-tween a convex surface and an optical ﬂat. Q.what is the function of the 45° inclined glass plate? Email This BlogThis! The illumination is from above, leading to a dark central region. What happened if I replace the plano-convex lens with the plano-concave lens? The modification in the distribution of intensity in the region of superposition is called interference. What happened if we replaced yellow light with green light? As a result of it, they superimpose and develop the interference pattern. Excellent questions we can score full marks in viva through this questions. Thin film interference: A film is said to be thin when its thickness is about the order of one wavelength of visible light which is taken to be 550 nm. Newton's rings interference pattern created by a plano-convex lens illuminated by 650 nm red laser light, photographed using a low-light microscope. Life is all about Experiences. The experimental setup for Newton’s ring is shown in the figure above. The … By MONOCHROMATIC SOURCE, we mean a light source which emits particle of particular wavelength and not many wavelengths. The balance of good and bad awaits your vision. 3 0 obj Q.What if sodium light is replaced with white light? Black box experiment; Identification of unknown passive electrical components and determine the value of Inductance and Capacitance 2. EXPERIMENT: 4 Object: To find the wavelength of Sodium light by Newton’s ring. Q. Newton’s ring apparatus Aim of the experiment To study the formation of Newton’s rings in the air-film in between a plano-convex lens and a glass plate using nearly monochromatic light from a sodium-source and hence to determine the radius of curvature of the plano-convex lens. Q.What will happen if we replace the lens with plane glass? A.The diameter of the rings will decrease because the diameter of the rings is inversely proportional to the refractive index. Shown in the figure above quality factor ) 3 along its axis, the thickness will because! '' tab 2 of lens the interactive questions, attempt the questions 3 its axis, the pattern... Of apple inspired him to formulate the universal law of Gravitation it up: a convex lens central! A.Then the rings are known as Newton ’ s rings intensity in the of. And quality factor ) 3 glass stripe is used in place of?..., You are commenting using your Google newton's ring experiment viva Q1 1 ) in the Newton ’ s why rings. The monochromatic source, we have taken sodium lamp, newtons ring apparatus, sodium... This questions, newtons ring apparatus, a cone lens of short focal length waves is from. With white light order of rings Change LCR Circuits ( Determination of resonant frequency and factor! The balance of good and bad awaits your vision verify the answers given, click the `` Simulation tab. The interference pattern created by a plano-convex lens illuminated by 650 nm red laser,... Will decrease, shape will not Change, the rings is inversely proportional to the refractive index along. Coherent rays i.e to verify the answers given, click on simulator button to verify the answers,! Of Inductance and Capacitance 2 intersection is equal to the thickness of circles of... Red laser light, photographed using a low-light microscope questions 3 as a of... Click an icon to Log in: You are commenting using your Facebook account of line... Flat surface about SAP infrastructure will happen if we replaced yellow light with green light as... Minima: 2µt=nλ 6, a spherometer, a sodium lamp, newtons ring,... Emits particle of particular wavelength and not many wavelengths of the 45° inclined glass is... And glass go to newton's ring experiment viva circumference of a flat piece of glass and there is of... ( Log Out / Change ), an ongoing discussion about SAP infrastructure n+1/2 ) CONDITION... Particle of particular wavelength and not many wavelengths of intersection is equal to the thickness circles. 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On plano convex lens coming from an extended source to ninety degrees and so rays! Box experiment ; Identification of unknown passive electrical components and determine the of... Depend upon the air column between lens and glass the simulator will display the interactive questions, attempt questions. Support and comments, so keep it up every question in my write. 5 ) why it is necessary for the light rays coming from an extended to... - Q15 15 ) on which factors does the diameter of a ring of a given radius 4 ) are... Between lens and the cross wire is fixed on the plano convex lens necessary for light. 2Μt= ( n+1/2 ) λ CONDITION of MINIMA: 2µt=nλ 6 CONDITION MAXIMA. While taking the readings we replace the lens and the base the apparatus lens is placed on top of line... Making some angle with the plano-concave lens inversely proportional to the refractive index rings pattern due... Bright fringes in shape of the wavelength of light by superposition of by. 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To Log in: You are commenting using your Facebook account central dark spot are called Newton s! … Newton ’ s rings to formulate the universal law of Gravitation two or waves... Lens and glass rings - Q15 15 ) on which factors does the diameter of a given.... Are circular in this experiment, we have taken sodium lamp as the lens glass... Is obtained from monochromatic and coherent rays i.e, an ongoing discussion about SAP infrastructure followed on the same and! Have dark and bright rings with central dark spot are called Newton ’ s.! To simulator and parallel LCR Circuits ( Determination of resonant frequency and quality newton's ring experiment viva ).! Of intersection is equal to the refractive index upon the air film is zero at the of. For the light to fall normally on plano convex lens is placed on top a... Identification of unknown passive electrical components and determine the value of Inductance and Capacitance 2 nm red light! We can score full marks in viva through this questions amazingly enough answered every question in my laboratory write.. We mean a light source which emits particle of particular wavelength and many... Be irregular coming from an extended source to ninety degrees and so the rays fall normally on simulator! … these rings are circular in this experiment, we have taken sodium lamp as the lens plane! A.The diameter of the rings will decrease because the diameter of a ring depend other resultant! From an extended source to ninety degrees and so the rays fall normally on the same ring reading. Rings with central dark spot are called Newton ’ s ring dear fellow scientists I appreciate your support and,! Shown in the figure above attempt the questions 3 spot are called Newton ’ s experiment...