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The speed of light in glass of refractive Index 1.5 is ${2×10}^{8} m/s$ .In a certain liquid the speed of light is $2 {.5×10}^{8} m/s$ .The refractive index of liquid is

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0.08

1.44

1.20

0.64

answer is C.

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Detailed Solution

μ_{1} = 1.5

$v_{1} = 2 \times 10^{8} {ms}^{- 1}$

$v_{2} = 2.5 \times 10^{8} {ms}^{- 1}$

$μ_{2} = ?$

$μ = \frac{c}{v}$

$\frac{μ_{1}}{μ_{2}} = \frac{v_{2}}{v_{1}} \Rightarrow \frac{1.5}{μ_{2}} = \frac{2 .5 \times 10^{8}}{2 \times 10^{8}}$

$μ_{2} = 1.2$

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