Question

Select the most appropriate word from the given box and fill in the following blanks.

normal 48.6° ray red refractive index vacuum 41° refraction 2.3

The ratio of real depth to apparent depth is called ______.

Answer 1

The ratio of real depth to apparent depth is called refractive index.

Explanation:

Due to the refraction of light emerging from an optically denser medium into air, an object immersed in it appears raised. The refractive index ($\mu$) of the medium is given by the formula $\mu = \frac{\text{Real depth}}{\text{Apparent depth}}$.