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NEET 2021 Model Test Paper 3

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Question : 5

Total: 180

Light of wavelength 6000 Å is incident on a thin glass plate of refractive index 1.5 such that angle of refraction into the plate is 60°. The smallest thickness of plate which will make it appear dark by reflection is :-

9×10−7 m
6×10−7 m
4×10−7 cm
5×107 cm

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