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Question

An air bubble in a glass slab with refractive index 1.5 (near normal incidence) is 5 cm deep when viewed from one surface and 3 cm deep when viewed from the opposite face. The thickness (in cm) of the slab is


A
12
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B
16
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C
8
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D
10
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Solution

The correct option is A 12

The apparent depth of bubble as seen from one surface = d1μ=dapp1=5 cm
Real depth of bubble from one surface d1=7.5cm

Similarly, real depth of bubble from other surface d2=1.5×3 cm=dapp2=4.5 cm

Hence the thickness of the glass is d1+d2=12 cm


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