Air Bubble Inside Glass Slab N 1 5 Appear From One Side At 6 Cm And From Other Side At 4 Cm

An air bubble inside glass slab (n = 1.5) appear from one side at 6 cm and from other side at 4 cm. Then the … cm (A) 5 (B) 10 (C)…

Answers:

The correct option is (C) 15.

 Explanation:

 η = [(real depth) / (apparent depth)] = (x/y)

  ∴ x = ny 

 y = apparent depth = 6 + 4 = 10 cm 

 hence x = 10 η = 10 × 1.5 = 15 cm 

 i.e. thickness of glass slab is 15 cm.