Question

A small air bubble is situated in a cube of $24cm$ edge when viewed from one face, it appear to be $10cm$ from the surface and through the opposite face is 6 m from the surface. Then the refractive index of the material of the cube is

• A. 1.6
• B. 1.5
• C. 1.3
• D. 1.4

Answer 1

Answer: (B)

Refractive index $(\mu )$ is defined as ratio of real depth upon apparent depth.

$\therefore$ Real depth $=24cm$,
apparent depth $=10+6=16cm$
$\therefore \mu =\frac{24}{16}=1.5$