Answer to Question #85938 in Optics for RANJEET MEENA

Question

Plz help solve this question :-

A plano-convex lens of radius 1.0 m is placed on an optically flat glass plate and is
illuminated by an extended monochromatic source. Assume that the point of contact
is perfect. The diameters of the 15th and 5th dark rings in the reflected light are
.5 90 10 m
−3
× and .3 36 10 m. −3
× Next, the space between the lens and the glass
plate is filled with a liquid. The diameter of the 5th ring changes to 0.3 10 m. −3
×
Calculate the refractive index of the liquid when the ring is (i) dark, and (ii) bright,
if the wavelength of light is 589 nm.

Answer 1

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