As a result of it, they superimpose and develop the interference pattern. When the air film is … Change ), You are commenting using your Google account. What happened if I replace the plano-convex lens with the plano-concave lens? Newton's rings is an interference pattern caused by the reflection of light between two surfaces - a spherical surface and an adjacent flat surface. In this experiment, we have taken sodium lamp as the monochromatic source. These procedure steps will be followed on the simulator 1. The fall of apple inspired him to formulate the universal law of Gravitation. realli it was very awesome,very helpful in enhancing and clearing the concepts.. best website for viva EXPERIMENTAL SET UP The cross wire of the microscope is fixed at a particular dark ring, say, nth and reading is noted on microscope. Change ), An ongoing discussion about SAP infrastructure. 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. << Newton’s rings . 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. 3 0 obj What happened if we replaced yellow light with green light? �MFk����� t,:��.FW������8���c�1�L&���ӎ9�ƌa��X�:�� �r�bl1� Q.How are Newton's rings formed? Thank you! This can be seen from the formula r 2 = (m + ½) λa, (3), as r 2 α λ 1. The global geometry of 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. Intensity of fringes also depend upon the air column between lens and the base. Q.What if a plane glass making some angle with the glass stripe  is used in place of lens? 2 0 obj 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. {{{;�}�#�tp�8_\. 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. 1 0 obj 1. This amazingly enough answered every question in my laboratory write up. The phenomenon of interference of light waves is obtained from monochromatic and coherent rays i.e. They arise from the interference of light. A.Few colored fringes will be observed near the center. ( Log Out /  Q.What will happen if we replace the lens with plane glass? 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. 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. (5) Why it is necessary for the light to fall normally on plano convex lens ? 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. These rings are known as Newton’s rings. Labels: NEWTON’S RINGS. 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, What are the uses of Newton's ring experiment ? 1. 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. Newton's Ring Experiment Procedure. A.Then interference will take place but the shape of the rings will be irregular. A.Then the rings will be of smaller diameter and there is chance of error while taking the readings. 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. ?���:��0�FB�x$ !���i@ڐ���H���[EE1PL���⢖�V�6��QP��>�U�(j The experimental setup: a convex lens is placed on top of a flat surface. 2. NEWTON’S RINGS - Q15 15) On which factors does the diameter of a ring depend? When the two or more waves superimpose over each other, resultant intensity is modified. The experimental setup for Newton’s ring is shown in the figure above. Email This BlogThis! Ans : Alternate dark and bright rings with central dark spot are called 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. rays of same frequency and constant phase difference. 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. ya,dear fellow scientists i appreciate your support and comments,so keep it up. As the lens is symmetric along its axis, the thickness is constant along the circumference of a ring of a given radius. Indulge into some deep and suspenseful blogs here. ( Log Out /  Change ), You are commenting using your Facebook account. >> ( Log Out /  Newton’s Rings and Determination of the Wavelength of Light Newton’s Rings. To set up and observe Newton’s rings. Ans. 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. 13.) Newtons ring experiment, Cogito Ergo Sum In 1717, Sir Isaac Newton studied the rings pattern generated due to interference of light. 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. A.They are formed as a result of interference between light waves reflected from the upper and lower surfaces of the… The redistribution of light by superposition of light waves is called as interference. Q.what is the function of the 45° inclined glass plate? (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.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. The microscope is moved to diametrically opposite side and the cross wire is fixed on the same ring and reading is noted. Physics Lab(15PHYL17/27) Viva Questions: EXPERIMENTS: 1. 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. The interference is between the reflexions from twoneighboring surfaces; 2. 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. The thickness will decrease ,shape will not change, the rings will come close as diameter decreases. Share to Twitter Share to Facebook Share to Pinterest. 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) It is really helpful for practical examination. accha kar rahe hain. 12.) endobj �@���R�t C���X��CP�%CBH@�R����f�[�(t� C��Qh�z#0 ��Z�l�`O8�����28.����p|�O×�X (4) What are Newton’s Rings ? 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. 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. The simulator will display the interactive questions, attempt the questions 3. 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. at 19:05. 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 . Ans. The modification in the distribution of intensity in the region of superposition is called interference. 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. Two salient reasons: 1. Q. Q.What if the glass plate is replaced with plane mirror? A.Then we will have dark and bright fringes in shape of a line. 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!! 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. *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�! 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. /Type /Pages Why Newton rings are circular in shape? 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. In this experiment Newton’s rings are investigated using monochromatic light trans-mitted through the apparatus. Newton's ring experiment 1. 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. 1 Presented by- Group 1 EE Batch 1 2. … x���wTS��Ͻ7�P����khRH �H�. 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. Newton gave the following list of colours from the centre outwards: First order: Black, blue, white, yellow, orange, red. /Kids [42 0 R 68 0 R 94 0 R 123 0 R 156 0 R 189 0 R 220 0 R] Life is all about Experiences. [/ICCBased 3 0 R] NEWTON’S RINGS BY REFLECTED LIGHT CONDITION OF MAXIMA: 2µt=(n+1/2)λ CONDITION OF MINIMA: 2µt=nλ 6. The air film formed is wedge shaped locus of point of intersection is equal to the thickness of circles . 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. << View all posts by Divya Prakash Srivastava. Q.Why do rings get closer as their order increases? After going through the theory and pretest, click the "Simulation" tab 2. )Travelling microscope,a sodium lamp,newtons ring apparatus,a spherometer, a cone lens of short focal length . Q.What are Newton's Rings? Q.What will happen if we use a lens of small radius of curvature? (determination of knee voltage, zener voltage and forward resistance) … Such fringes were first obtained by … A.The diameter of the rings will decrease because the diameter of the rings is inversely proportional to the refractive index.

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