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in Optics by (48.1k points)
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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

1 Answer

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Best answer

(c) 12 cm

Let d1 = 5 cm and d2 = 3 cm ; n = 1.5 

Actual width is the sum of real depth from 2 sides 

Thickness of slab = d1n + d2

= (5 x 1.5) +(3 x 1.5)= 12 cm

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