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Q.

Light of wavelength 300 nm in medium A enters into medium B through a plane surface. If the frequency of light is $5 \times 10^{14} H z$ and the ratio of speed in medium A to that is medium B is $\frac{4}{5},$ the absolute refractive index of medium B is

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a

1.6

b

1.5

c

1.3

d

1.45

answer is A.

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Detailed Solution

$μ \propto \frac{1}{v}$

$\frac{μ_{A}}{μ_{B}} = \frac{v_{B}}{v_{A}}$

$μ_{B} = 1.6$

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Light of wavelength 300 nm in medium A enters into medium B through a plane surface. If the frequency of light is 5×1014Hz and the ratio of speed in medium A to that is medium B is 45,the absolute refractive index of medium B is