Question

calculate the time in which sunlight can pass through a glass of 4mm. Whose refractive Index Is
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Answer 1

Answer:

Let S be the speed of light in the window

1/1.5 = S/3*10^8

Since speed of light in air is 3*10^8m/s and refractive index of air is 1

S = 2*10^8 m/s

Time = distance / speed

= 4*10^-3m/2*10^8 = 2*10^-11 s