9 a An electromagnetic radiation of wavelength ranging between 400 nm and 1150 nm for...

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9 a An electromagnetic radiation of wavelength ranging between 400 nm and 1150 nm for which the plate is penetrable incident perpendicularly on the plate from above is reflected from both the air surfaces and interferes In this range only two wavelength give maximum reinforcements one of them is 400 nm refractive index of air 1 and the coefficient of linear of cube 8 x 10 C The thermal expansion distance of bottom of cube from plate does not change during warming up Choose the correct option s cube murm A The change in temperature of cube so that it would touch the plate is 6 2 C B The change in temperature of cube so that it would touch the plate is 3 1 C C The second wavelength which gives maximum reinforcement is 2000 3 4000 D The second wavelength which gives maximum reinforcement is 3 nm nm 400 11 50 Plate h 2 cm

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