Embibe Experts Solutions for Chapter: Ray Optics, Exercise 1: Exercise-1

Dispersive power of a prism depends on-

Two thin lenses, one convex of focal length $30 \mathrm{cm}$ and the other concave of focal length $10 \mathrm{cm}$ are put into contact. If this combination is equivalent to an achromatic lens then the ratio of dispersive powers $\left(\frac{{\omega }_1}{{\omega }_2}\right)$ of the above two lenses is -

All the listed things below are made of flint glass. Which one of these has greatest dispersive power $\left(\omega \right)$?

When white light passes through the achromatic combination of prisms, then what is observed?

What wii be the ratio of the angle of minimum deviation of a prism when it is dipped in water and when it is in air ? Given refractive index of glass with respect to air is  ${}_a{\mu }_g=\frac{3}{2}$and refractive index of water with respect to air is${}^a\mu _w=\frac{4}{3}$. Assuming prism angle is very small.

The respective angle of the flint and crown glass prisms are $A\text{'}$ and $A.$ They are to be used for dispersion without deviation then, the ratio of their angles $\frac{A\text{'}}{A}$ will be

Rainbows are formed by 

Refractive index for a material for infra-red light is