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

3 \times 10^{- 8} s

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2 \times 10^{- 8} s

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3 \times 10^{- 11} s

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2 \times 10^{- 11} s

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Solution

The correct option is B $2 \times 10^{- 11} s$
Given,
Refractive index of medium = 1.5
Thickness of window $= 4 m m = 4 \times 10^{- 3} m$
Velocity of light in the window
$= \frac{3 \times 10^{8}}{1.5} m s^{- 1} = 2 \times 10^{8} m s^{- 1}$

Hence $t = \frac{4 \times 10^{- 3}}{2 \times 10^{8}} s = 2 \times 10^{- 11} s$

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

The correct option is B 2×10−11sGiven, Refractive index of medium = 1.5Thickness of window =4 mm=4×10−3 mVelocity of light in the window =3×1081.5ms−1=2×108ms−1Hence t=4×10−32×108s=2×10−11s