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An air bubble in glass slab of refractiv...

An air bubble in glass slab of 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 of the slab is,

A

8 cm

B

10 cm

C

12 cm

D

16 cm

Text Solution

Verified by Experts

The correct Answer is:
C
Let `d_(1)` = 5 cm and `d_(2)` = 3 cm , n = 1.5
Actual width is the sum of real depth from 2 sides
Thickness of slab = `d_(1) n + d_(2) n`
`= (5 xx 1.5) +(3 xx 1.5)`= 12 cm
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