Umakant Kondapure, Collin Fernandes, Nipun Bhatia, Vikram Bathula and, Ketki Deshpande Solutions for Chapter: Refraction of Light, Exercise 4: Evaluation Test

Diamond is optically more dense than water because

A diver swims obliquely above a fish in water. If he wants to hit the fish, he must aim

Critical angle of glass is ${\theta }_1$ and that of water is ${\theta }_2$.  The critical angle for water and glass surface would be $\left({\mu }_g=\frac{3}{2}, {\mu }_w=\frac{4}{3}\right)$

The value of critical angle is least for which of the following colours of light?

It is found that all electromagnetic signals sent from $P$ towards $Q$ reach point $R$. The speed of electromagnetic signals in glass cannot be

The angular dispersion produced by a small angle prism placed in air

Between the primary and secondary rainbows, there is a dark band known as Alexander's dark band. This is because

Assertion: The rainbow is seen sometimes in the sky when it is raining. When one sees a rainbow, one's back is towards the sun.

Reason: Internal reflection from water droplet causes dispersion. The final ray is in the backward direction.