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Question

A ray of light takes 1019 second to cross a glass slab of refractive index 1.5. The thickness of the slab will be

A
10 cm
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B
20 cm
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C
30 cm
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D
40 cm
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Solution

The correct option is B 20 cm
it should be given 109sec as the time
velocity of light in the medium is cμ
thickness is 109×3×2×1083=0.2m=20cm
option B is correct .
in question time is to be changed

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