Question
Newton’s rings are formed with reflected light of wavelength 589 nm using a plano- convex lens and a plane glass plate with a liquid between them. The diameter of the
15th ring is 5.1 mm and radius of curvature of the curved surface of the lens is 1 m.
Calculate the refractive index of the liquid if the ring is dark.
Answer :
Word Count : 49
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Skip in 10
=589nm
n = 15
R = 1m
r = 5.1mm 5.1 x 10-3 m
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