Q.

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

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a

8

b

10

c

12

d

16

answer is C.

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Detailed Solution

Here  μ =1.5l= length of the slabx= position of air bubble from one side As per question,total apparent length of slab= 5+3  or, xμ+(l-x)μ=8 or ,lμ=8∵l=8μ=8×1.5=12 cm
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