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. Newton's rings interference pattern created by a plano-convex lens illuminated by 650 nm red laser light, photographed using a low-light microscope. Q.What if the glass plate is replaced with plane mirror? They arise from the interference of light. 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. Why Newton rings are circular in shape? … ( Log Out /  This amazingly enough answered every question in my laboratory write up. Two salient reasons: 1. 2 0 obj Excellent questions we can score full marks in viva through this questions. The … Q.What will happen if we use a lens of small radius of curvature? 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. /Kids [42 0 R 68 0 R 94 0 R 123 0 R 156 0 R 189 0 R 220 0 R] Newton observed these rings when placing a spherically shaped piece of glass (a lens) touching a flat piece of glass. Newton's Ring Experiment Procedure. A.Few colored fringes will be observed near the center. Q.What will happen if we replace the lens with plane glass? Indulge into some deep and suspenseful blogs here. NEWTON’S RINGS BY REFLECTED LIGHT CONDITION OF MAXIMA: 2µt=(n+1/2)λ CONDITION OF MINIMA: 2µt=nλ 6. In 1717, Sir Isaac Newton studied the rings pattern generated due to interference of light. NEWTON’S RINGS - Q15 15) On which factors does the diameter of a ring depend? As the lens is symmetric along its axis, the thickness is constant along the circumference of a ring of a given radius. Black box experiment; Identification of unknown passive electrical components and determine the value of Inductance and Capacitance 2. 12.) View all posts by Divya Prakash Srivastava. When the two or more waves superimpose over each other, resultant intensity is modified. Ans. 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. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. 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) 1 Presented by- Group 1 EE Batch 1 2. 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. The fall of apple inspired him to formulate the universal law of Gravitation. 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. rays of same frequency and constant phase difference. 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. It is really helpful for practical examination. Ans. Q.What will happen if few drops of liquid is introduced between the lens and glass? Hence, Newton’s rings are circular. 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. Formula used: … Q.What if sodium light is replaced with white light? Newton's rings is an interference pattern caused by the reflection of light between two surfaces - a spherical surface and an adjacent flat surface. �MFk����� t,:��.FW������8���c�1�L&���ӎ9�ƌa��X�:�� �r�bl1� Intensity of fringes also depend upon the air column between lens and the base. Newtons Ring Experiment Viva. 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. As a result of it, they superimpose and develop the interference pattern. A.The diameter of the rings will decrease because the diameter of the rings is inversely proportional to the refractive index. Newtons ring experiment, Cogito Ergo Sum newtons rings • 19k views. A.They are formed as a result of interference between light waves reflected from the upper and lower surfaces of the… Experiment no. An important application of interference in thin films is the formation of Newton’s rings. endobj Series and parallel LCR Circuits (Determination of resonant frequency and quality factor) 3. This can be seen from the formula r 2 = (m + ½) λa, (3), as r 2 α λ 1. 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. By MONOCHROMATIC SOURCE, we mean a light source which emits particle of particular wavelength and not many wavelengths. Q.What are Newton's Rings? )Travelling microscope,a sodium lamp,newtons ring apparatus,a spherometer, a cone lens of short focal length . What are the uses of Newton's ring experiment ? /Type /Pages 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. Ans.) A.Then interference will take place but the shape of the rings will be irregular. 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. realli it was very awesome,very helpful in enhancing and clearing the concepts.. best website for viva {{{;�}�#�tp�8_\. 2. ?���:��0�FB�x$ !���i@ڐ���H���[EE1PL���⢖�V�6��QP��>�U�(j Q. Newton's ring experiment 1. Share to Twitter Share to Facebook Share to Pinterest. A.Then we will have dark and bright fringes in shape of a line. 3. Labels: NEWTON’S RINGS. Q.How are Newton's rings formed? >> /Filter /FlateDecode I–V Characteristics of Zener Diode. Email This BlogThis! 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. After going through the theory and pretest, click the "Simulation" tab 2. endobj Thank you! The interference is between the reflexions from twoneighboring surfaces; 2. Ans : The path difference along the circle is constant that’s why the rings are circular in this experiment. In this experiment Newton’s rings are investigated using monochromatic light trans-mitted through the apparatus. 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. [/ICCBased 3 0 R] EXPERIMENTAL SET UP The cross wire of the microscope is fixed at a particular dark ring, say, nth and reading is noted on microscope. Physics Lab(15PHYL17/27) Viva Questions: EXPERIMENTS: 1. The air film formed is wedge shaped locus of point of intersection is equal to the thickness of circles . accha kar rahe hain. Ans : Alternate dark and bright rings with central dark spot are called newton’s rings. ( Log Out /  EXPERIMENT: 4 Object: To find the wavelength of Sodium light by Newton’s ring. The simulator will display the interactive questions, attempt the questions 3. 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. These concentric rings are known as " Newton's Rings ". The modification in the distribution of intensity in the region of superposition is called interference. /Count 7 A.Then the rings will be of smaller diameter and there is chance of error while taking the readings. �@���R�t C���X��CP�%CBH@�R����f�[�(t� C��Qh�z#0 ��Z�l�`O8�����28.����p|�O×�X These rings are known as Newton’s rings. 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. 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. 1 0 obj Viva Voce for by Newton’s Ring. Sorry for my bad grammar. Click "Submit" button to verify the answers given, click on simulator button to skip the test and go to simulator. 13.) Tq u air thanks a lot. 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 . The redistribution of light by superposition of light waves is called as interference. 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. stream 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. 1. very good sir. %PDF-1.7 These procedure steps will be followed on the simulator 1. Thank you! Life is all about Experiences. 4. 3 0 obj 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, Would the shape and the order of rings change? Change ), You are commenting using your Twitter account. The key idea behind Newtons ring experiment is the thin film formation between a plane-convex lens and a glass plate. Very useful stuff. Q. Q.What if a plane glass making some angle with the glass stripe  is used in place of lens? Change ), An ongoing discussion about SAP infrastructure. The balance of good and bad awaits your vision. 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. The phenomenon of interference of light waves is obtained from monochromatic and coherent rays i.e. The microscope is moved to diametrically opposite side and the cross wire is fixed on the same ring and reading is noted. NEWTON’S RINGS - Q1 1) In the Newton’s ring experiment, how does interference occur? /Length 2596 Such fringes were first obtained by … Newton gave the following list of colours from the centre outwards: First order: Black, blue, white, yellow, orange, red. What do you mean by interference of light? Q.Why do rings get closer as their order increases? ( Log Out /  Q.what is the function of the 45° inclined glass plate? 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�! Newton’s rings . The thickness of the air film is zero at the point of contact and gradually increases outwards from the point of contact. 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. 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. (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. @~ (* {d+��}�G�͋љ���ς�}W�L��$�cGD2�Q���Z4 E@�@����� �A(�q`1���D ������`'�u�4�6pt�c�48.��`�R0��)� (determination of knee voltage, zener voltage and forward resistance) … Change ), You are commenting using your Facebook account. In this experiment, we have taken sodium lamp as the monochromatic source. ( Log Out /  at 19:05. isi chij ki to talas hai . To determine the wavelength of the given source. 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 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. x���wTS��Ͻ7�P����khRH �H�. The global geometry of Newton’s rings. 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. (5) Why it is necessary for the light to fall normally on plano convex lens ? 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. Why the rings are circular ? 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. Newton’s Rings and Determination of the Wavelength of Light Newton’s 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. /N 3 The thickness will decrease ,shape will not change, the rings will come close as diameter decreases. The experimental setup: a convex lens is placed on top of a flat surface. The experimental setup for Newton’s ring is shown in the figure above. What happened if we replaced yellow light with green light? << 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!! What happened if I replace the plano-convex lens with the plano-concave lens? Change ), You are commenting using your Google account. The illumination is from above, leading to a dark central region. 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 … >> (4) What are Newton’s Rings ? 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. 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. 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. To set up and observe Newton’s rings. These rings are known as Newton’s rings. When the air film is … << ya,dear fellow scientists i appreciate your support and comments,so keep it up. Questions 3 is zero at the point of contact and gradually increases outwards from the point of contact ) are. 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