# newton's ring experiment observation table

Theory of Fringes: The effective path difference between the two reflected rays R 1 and R 2 for a wedge shaped film from equation 2.18. ... Concept of locus in Newtons rings Experiment by Dr ashutosh Pandey - … I. They arise from the interference of light. (ii) Using Newton’s rings, the refractive index of a liquid can be calculated. Find the vernier constant (least count) of the horizontal scale of the travelling microscope. As we proceed outwards from the center, the thickness of the air film. EXPERIMENT: 4 Object: To find the wavelength of Sodium light by Newton’s ring. 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. Interference fringes are alternately bright and dark patches of light obtained in the region of superposition. Check whether you have precisely written all the contents of printed write up. Observation and calculations of Newton's ring experiment? To avoid this thin lens should be used. 8.3). The two interfering 3) as the ray of light passes from, rarer to denser medium. If you need Newton's ring experiment reading. The rings 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. If the radius of curvature of plano-convex lens is much greater than distance ‘r’ and the system is viewed through the above, the pattern of dark & bright ring is observed. 4. Table 8.1: Sample data table Ring Number Lm j Lm - L1j Rm j Rm - R1j Dm 24 23 22.. 1 Spherometer A spherometer is used to ﬁnd R, the radius of curvature of the lens. The corresponding ray diagram is as shown in Figure 1. When monochromatic light is allowed to fall normally on this air film and viewed in reflected light, alternate dark and bright rings are observed. At 4.4 million pounds, it seems unlikely that this beast will leave the atmosphere. The diameters of the rings are measured. This is so because the air film formed is wedge shaped and loci of points of equal thickness of air film are circles concentric with point of contact. If the radius of curvature of the lens is 100 cm, find the wave length of the light. 3. When a plano-convex lens is placed over a flat glass plate, then a thin air layer is formed between glass plate and a convex lens. [June 2005, Set No. One of the two reflections takes place at the surface of the denser medium and hence it introduces an additional phase change of π or an equivalent path difference λ/2 between two wavelets. There is no loss of energy in interference phenomenon, only redistribution of energy takes place. The square of the diameter and hence Dn 2 and D 2 n+m are found out. Introduction: I.1 The phenomenon of Newton’s rings is an illustration of the interference of light waves reflected from the opposite surfaces of a thin film of variable thickness. Diameter of Newton’s 15 th ring … 2] Sol: The given data are. Professional Association of Diving Instructors. The modification in the distribution of intensity in the region of superposition is called as interference. Under white light we get coloured fringes. The redistribution of energy by superposition of light waves is called as interference. 1.Level the travelling microscope table and set the microscope tube in a vertical position. Substituting gives. & are Ring No. Note that you are not permitted to reduce the contents of the write up. Concept Q. EXPERIMENT NO.- OBJECT To determine the wavelength of sodium light by Newton’s ring. Newtons Ring Experiment1 - Free download as Word Doc (.doc / .docx), PDF File (.pdf), Text File (.txt) or read online for free. 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