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: A soap film of refractive index 4/3 and ofthickness 1.5 x 104 cm is illuminated bywhite light incident at an angle of 45°.The light reflected by it is examined by aspectroscope in which a dark bandcorresponding to a wavelength of5 x 10-5 cm is found. Calculate the orderof the interference band. (Ans. : 6)

Answer»

lamba= 5×10^-5cm=5000 angstrom



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