A monochromatic light passes through a glass slab of refractive index 3/2 of thickness 90 cm in time t 1. If it takes a time t 2 to travel the same distance through water of refractive index 4/3. The value of t 1 - t 2 is
(1) 5×10^-8s
(2) 5×10^-10s
(3)2.5×10^-10s
(4)2.5×10^-8s
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answer=(4/3)(10/8)
frequency is constant, whereas speed is directly proportional to wavelength
muneshhooda1977:
But this is not the answer dear as options r there and by solving this it is not given in the options then tell me wht can i do now??
option is incorrect
the answer is same
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plss help me dear by solving this question
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