Question

please help me for question number 121

Answer 1

hello friend...!!


• option ' A ' is the correct answer


• According to the question we should calculator the time taken by the ray to cross the slab


• we know that,

T = d / V

here ' d ' denotes the thickness of slab and v denotes c/Φ where ' c ' is velocity of light and Φis the refractive index.

therefore,

T = ( 4 x 10^-2 x 3/2 ) / 3 x 10^8

therefore,

T = 6 x 10^-2 / 3 x 10^8

therefore,

T = 2 x 10^-10 sec

therefore option ' A ' is the correct answer

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Hope it is useful...!!