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Light of wavelength 6000 A is incident on a thin 5. glass plate of refractive index 1.5 such that angleof refraction into the plate is 60°. The smallestthickness of plate which will make it appear darkby reflection is :-(1) 4 x 10-7 m (2) 6x 10-7 m4 x 10-7 cm (4) 6 x 10-7 cm0 |
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