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Statement of a problem № 4017

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A parallel beam of light (L = 5890 A°) is incident on a thin glass plate of refractive index 1.5 such that the angle of refraction in the plate is 60°. Calculate the smallest thickness of the plate which will appear dark by reflection.

Solution:
A parallel beam of light (L  = 5890 A°) is incident on a thin glass plate of re

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