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Standard XII

Chemistry

Crystalline and Amorphous Solid

A ray of ligh...

Question

A ray of light takes $10^{- 19}$ second to cross a glass slab of refractive index $1.5$ . The thickness of the slab will be

10 c m

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20 c m

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30 c m

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40 c m

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Solution

The correct option is B $20 c m$
it should be given $10^{- 9} s e c$ as the time
velocity of light in the medium is $\frac{c}{μ}$
thickness is $10^{- 9} \times \frac{3 \times 2 \times 10^{8}}{3} = 0.2 m = 20 c m$
option $B$ is correct .
in question time is to be changed

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A ray of light takes 10−19 second to cross a glass slab of refractive index 1.5. The thickness of the slab will be

The correct option is B 20 cmit should be given 10−9sec as the timevelocity of light in the medium is cμthickness is 10−9×3×2×1083=0.2m=20cmoption B is correct . in question time is to be changed

A ray of light takes $10^{- 19}$ second to cross a glass slab of refractive index $1.5$ . The thickness of the slab will be

The correct option is B $20 c m$
it should be given $10^{- 9} s e c$ as the time
velocity of light in the medium is $\frac{c}{μ}$
thickness is $10^{- 9} \times \frac{3 \times 2 \times 10^{8}}{3} = 0.2 m = 20 c m$
option $B$ is correct .
in question time is to be changed