Light of wavelength 6000 \stackrel{o}{A} is incident on a thin glass plate of r.i. 1.5 such that the angle of refraction into the plate is 60^{\circ}. Calculate the smallest thickness of the plate which will make dark fringe by reflected beam interference.

WBJEE 2024 Physics & Chemistry Paper

Question : 55 of 80

Marks: +1, -0

Light of wavelength 6000

is incident on a thin glass plate of r.i. 1.5 such that the angle of refraction into the plate is 60∘. Calculate the smallest thickness of the plate which will make dark fringe by reflected beam interference.

‌1.5×10−7m
‌2×10−7m
‌3.5×10−7m
‌4×10−7m

Validate

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