Embibe Experts Solutions for Chapter: Ray Optics and Optical Instruments, Exercise 1: Rajasthan Board-2020

An object is placed at $20 \mathrm{cm}$ from a convex lens. If $3$ times magnified real image is formed by the lens then find the focal length of lens.

Write relation between power of lens and it's focal length.

Write definitions:

Total internal reflection.

Deduce an expression for mirror equation. Draw necessary ray diagram.

Find focal length of a spherical mirror of radius of curvature $10\mathrm{cm}$.

What do you understand by scattering of light?

Focal length of a convex lens in air is $25 \mathrm{cm}$. If it is immersed in water, then calculate the focal length of the lens. $\left({\mathrm{n}}_{\mathrm{w}}=\frac{4}{3}, {\mathrm{n}}_{\mathrm{g}}=\frac{3}{2}\right)$

What is Presbyopia? Describe the construction and working of reflecting telescope. Draw necessary ray diagram.