Question

How deep will a 4 m deep tank appear when seen in air due to optical refraction? The refractive index of water is `4/3`.

Answer 1

Given:

Real depth of the tank, d = 4 m

Refractive index of water, n = `4/3`​

Formula:

n = `"Real depth"/"Apparent depth"`

Apparent depth = `"Real depth"/n`

= `4/(4/3)`

= `4 xx 3/4`

= 3 m

The tank will appear to be 3 m deep when viewed from air due to optical refraction.