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Q.

The speed of light in glass of refractive index 1.5 is 4×108m/s . In a certain liquid the speed of light is 2.5×108m/s . The refractive index of liquid is                     

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a

4.2

b

2.4

c

1.8

d

1.6

answer is A.

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Detailed Solution

μ1=1.5

v1=4×108m/s

v2=2.5×108m/s

μ2=?

μ1μ2=V2V1

1.5μ2=2.5×1084×108

1.5μ2=0.625

1.50.625=μ2

2.4=μ2

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