Newton’s rings is a phenomenon in …

Newton’s rings is a phenomenon in which an interference pattern is created by the reflection of light between two surfaces: a spherical surface and an adjacent touching flat surface. It is named after Isaac Newton , who investigated the effect in his 1704 treatise Opticks. When viewed with monochromatic light, Newton’s rings appear as a series of concentric , alternating bright and dark rings centered at the point of contact between the two surfaces. When viewed with white light, it forms a concentric ring pattern of rainbow colors, because the different wavelengths of light interfere at different thickness of the air layer between the surfaces. (i) In an interference experiment , the ratio of amplitudes of coherent waves is 1:3. The ratio of maximum and minimum intensities of fringes will be (a) 4 (b) 9 (c) 2 (d) 18 (ii) Two coherent sources of intensity 10 W/m2 and 25W/m2 interfere to form fringes. Find the ratio of maximum intensity to minimum intensity. (a) 15.54 (b) 16.78 (c) 19.72 (d) 18.39 (iii) Which of the following does not show interference? (a) Soap bubble (b) Excessively thin film (c) A thick film (d) Wedge shaped film (iv) Two slits in Young’s double slit experiment have widths in the ratio 81:1. The ratio of the amplitudes of light waves is (a) 3:1 (b) 3:2 (c) 9:1 (d) 6:1

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