Question

A transparent cube of 15cm edge contains a small air bubble. Its apparent depth when viewed through one face is 6cm and when viewed through the opposite face is 4cm. Then, the refractive index of the material of the cube is:

• A. 2
• B. 2.5
• C. 1.6
• D. 1.5

Answer 1

The correct option is D

1.5

Assume ‘x’ be the real depth from one side
$\mu =\frac{x}{6}=\frac{15-x}{4}x=9\mu =\frac{x}{6}=\frac{9}{6}\mu =1.5$