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Question

A transparent cube of 15 cm edge contains a small air bubble. Its apparent depth when viewed through one face is 6 cm and when viewed through opposite face is 4 cm. The refractive index of material of cube is

A
2
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B
1.5
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C
1.6
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D
2.5
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Solution

The correct option is B 1.5

When light enters from denser to rarer medium
real depthapparent depth=R.I(μ)

Let
the real depth of the object from one face be x
Given apparent depth from this face is 6 cm
x6=μ

x=6μ

real depth from opposite face is 15x
apparent depth from opposite face is 4 cm

15x4=μ

15x=4μ
Substituting
15=10μ

μ=1.5


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