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CBSE Test Paper-01, Class - 12 Physics (Wave Optics), , 1. Referring to the Young's double slit, experiment, if D is the distance from two, slit plane to screen and d the distance, between two coherent sources then, fringe width is given by, , 4, 3AD, ‘d, b, 2A2D, , Cc. —, d AD, , 2. Monochromatic light of wavelength 589, nm is incident from air on a water, surface. What is the wavelength and, speed of reflected light?, , a. 589 nm, 3 x10° m/s, b. 599 nm, 3 x 108m/s, c. 582 nm, x10° m/s, , d. 590 nm, 3 x 10° m/s, , 3. Referring to the Young's double slit, experiment, Phase difference, corresponding to a Path Difference of 4, is, , a. 180°, b. 90°, c. 60°, d. 120°