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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

Options

  1. A8
  2. B10
  3. C12
  4. D16

Correct answer

C. 12

Step-by-step solution

Apparent depth = R e a l   d e p t h   f r o m   s u r f a c e R e f r a c t i v e   i n d e x d = d 1 + d 2 μ = 1.5 5 + 3 = 12   cm

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