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Q.

An air bubble is 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

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a

8

b

10

c

12

d

16

answer is C.

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Detailed Solution

AD1=t1μ, AD2=t2μ ; AD1+AD2=t1μ+t2μ (5+3)1.5= t1+ t2 ; t1+ t2=12cm
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