MHT CET Physics question

Time taken by the sunlight to pass through a window of thickness 4 mm whose refractive index 1.5 is

Answer: (C)

Solution

\dfrac{d}{v}\dfrac{μ d}{c}\dfrac{1.5×4×10^{-3}}{3×10^{8}}$=2×1

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Question ID VK-077179