Question

Light of wavelength 5880 Å is incident on a thin film of glass of u = 1.5 such that
the angle of refraction in the plate is 60°. Calculate the smallest thickness of the
plate which will make it dark by reflection.​

Answer 1

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Explanation:

From equation of destructive interference,

2tcosθ=nλ​

where, n is refractive index.

Using other values from the problem statement,

t=1.55880Ao​=3920Ao

Answer 2

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