Embibe Experts Solutions for Exercise 1: ICSE-2019

State the relation between the critical angle and the absolute refractive index of a medium.

Which colour of light has a higher critical angle? Red light or Green light.

The following diagram shows a $60°, 30°, 90°$ glass prism of critical angle $42°$. Copy the diagram and complete the path of incident ray AB emerging out of the prism marking the angle of incidence on each surface.

State one important factor which affects the critical angle of a given medium.

What is the relation between the refractive index of water with respect to air $\left({}_{a }\mu _w\right)$, and the refractive index of air with respect to water $\left({}_{w }\mu _a\right)$.

A ray of light falls normally on a rectangular glass slab. Draw a ray diagram showing the path of the ray till it emerges out of the slab.
 

Complete the path of the monochromatic light ray AB incident on the surface PQ of the equilateral glass prism PQR till it emerges out of the prism due to refraction.

A pond appears to be $2.7 \mathrm{m}$ deep. If the refractive index of water is $\frac{4}{3}$, find the actual depth of the pond.