Q. A small air bubble is inside a transparent cube of side length 24cm and of refractive index 4/3. If the apparent distance air bubble from a face is 9cm then its apparent distance from opposite face is
(a) 6 cm
(b) 8 cm
(c) 9 cm
(d) 12 cm
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Ans: (c)
Sol: Refractive index , μ = Real distance / Apparent distance
Real distance = μ×Apparent distance = 9×4/3 = 12 cm
Apparent distance from opposite face = Real distance / μ = 12/(4/3) = 36/4 = 9 cm