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. @~ (* {d+��}�G�͋љ���ς�}W�L��$�cGD2�Q���Z4 E@�@����� �A(�q`1���D ������`'�u�4�6pt�c�48.��`�R0��)� Newton's ring experiment 1. 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. A.Then the rings will be of smaller diameter and there is chance of error while taking the readings. 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.Then we will have dark and bright fringes in shape of a line. After going through the theory and pretest, click the "Simulation" tab 2. To set up and observe Newton’s rings. Two salient reasons: 1. Experiment no. 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. View all posts by Divya Prakash Srivastava. rays of same frequency and constant phase difference. (determination of knee voltage, zener voltage and forward resistance) … What happened if I replace the plano-convex lens with the plano-concave 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. Q.What if a plane glass making some angle with the glass stripe  is used in place of lens? 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. Black box experiment; Identification of unknown passive electrical components and determine the value of Inductance and Capacitance 2. Such fringes were first obtained by … 1 0 obj Share to Twitter Share to Facebook Share to Pinterest. These concentric rings are known as " Newton's Rings ". Newton's rings is an interference pattern caused by the reflection of light between two surfaces - a spherical surface and an adjacent flat surface. Q.What will happen if few drops of liquid is introduced between the lens and glass? 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. Q.What if sodium light is replaced with white light? 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.Why do rings get closer as their order increases? 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. (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. 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 Ring Experiment Procedure. To determine the wavelength of the given source. 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. The global geometry of Newton’s rings. The redistribution of light by superposition of light waves is called as interference. A.Then interference will take place but the shape of the rings will be irregular. By MONOCHROMATIC SOURCE, we mean a light source which emits particle of particular wavelength and not many wavelengths. Very useful stuff. Change ), You are commenting using your Twitter account. Change ), An ongoing discussion about SAP infrastructure. Newton’s Rings and Determination of the Wavelength of Light Newton’s Rings. What happened if we replaced yellow light with green light? Q.What if the glass plate is replaced with plane mirror? endobj Q.What are Newton's Rings? /Length 2596 {{{;�}�#�tp�8_\. 2 0 obj Life is all about Experiences. The experimental setup: a convex lens is placed on top of a flat surface. accha kar rahe hain. Hence, Newton’s rings are circular. Q.what is the function of the 45° inclined glass plate? The simulator will display the interactive questions, attempt the questions 3. << ya,dear fellow scientists i appreciate your support and comments,so keep it up. What are the uses of Newton's ring experiment ? Why Newton rings are circular in shape? Excellent questions we can score full marks in viva through this questions. ( Log Out /  realli it was very awesome,very helpful in enhancing and clearing the concepts.. best website for viva at 19:05. Tq u air thanks a lot. Newton's rings interference pattern created by a plano-convex lens illuminated by 650 nm red laser light, photographed using a low-light microscope. The phenomenon of interference of light waves is obtained from monochromatic and coherent rays i.e. Q.What will happen if we replace the lens with plane glass? Newton’s rings . x���wTS��Ͻ7�P����khRH �H�. Click "Submit" button to verify the answers given, click on simulator button to skip the test and go to simulator. 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. 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. Email This BlogThis! Ans. Would the shape and the order of rings change? This amazingly enough answered every question in my laboratory write up. The key idea behind Newtons ring experiment is the thin film formation between a plane-convex lens and a glass plate. Indulge into some deep and suspenseful blogs here. 3. These procedure steps will be followed on the simulator 1. endobj Viva Voce for by Newton’s Ring. >> NEWTON’S RINGS BY REFLECTED LIGHT CONDITION OF MAXIMA: 2µt=(n+1/2)λ CONDITION OF MINIMA: 2µt=nλ 6. 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. �@���R�t C���X��CP�%CBH@�R����f�[�(t� C��Qh�z#0 ��Z�l�`O8�����28.����p|�O×�X 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, Series and parallel LCR Circuits (Determination of resonant frequency and quality factor) 3. 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. 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. EXPERIMENTAL SET UP The cross wire of the microscope is fixed at a particular dark ring, say, nth and reading is noted on microscope. NEWTON’S RINGS - Q1 1) In the Newton’s ring experiment, how does interference occur? Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. Ans : Alternate dark and bright rings with central dark spot are called newton’s rings. 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. %PDF-1.7 1. 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!! >> Newtons Ring Experiment Viva. The interference is between the reflexions from twoneighboring surfaces; 2. 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. 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. very good sir. NEWTON’S RINGS - Q15 15) On which factors does the diameter of a ring depend? (5) Why it is necessary for the light to fall normally on plano convex lens ? The thickness will decrease ,shape will not change, the rings will come close as diameter decreases. In 1717, Sir Isaac Newton studied the rings pattern generated due to interference of light. )Travelling microscope,a sodium lamp,newtons ring apparatus,a spherometer, a cone lens of short focal length . /N 3 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. They arise from the interference of light. What do you mean by interference of light? [/ICCBased 3 0 R] 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. The microscope is moved to diametrically opposite side and the cross wire is fixed on the same ring and reading is noted. 12.) Q.What will happen if we use a lens of small radius of curvature? When the air film is … The modification in the distribution of intensity in the region of superposition is called interference. ( Log Out /  A.They are formed as a result of interference between light waves reflected from the upper and lower surfaces of the… I–V Characteristics of Zener Diode. 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 … �MFk����� t,:��.FW������8���c�1�L&���ӎ9�ƌa��X�:�� �r�bl1� 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. 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. Change ), You are commenting using your Facebook account. A.Few colored fringes will be observed near the center. Intensity of fringes also depend upon the air column between lens and the base. 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