Embibe Experts Solutions for Chapter: Ray Optics and Optical Instruments, Exercise 1: Punjab Board-2018

What is total internal reflection of light ? What are the two essential conditions for total internal reflection to take place?

With the help of a ray diagram, describe the construction, working of a compound microscope when the final image is formed at least distance of distinct vision $\left(\mathrm{D}=25 \mathrm{cm}\right).$(D = 25cm). Derive an expression for its magnifying power $\left(\mathrm{m}\right)$.

Two lenses of powers $+15 \mathrm{D}$ and $-5 \mathrm{D}$ are in contact with each other. What is the focal length of combination

Why does sky appear blue?

With the help of a suitable diagram, sign conventions and assumptions, derive Lens Maker's formula for convex lens.
 

Why does diamong sparkle?

Derive lens formula $\left[\frac{1}{v}-\frac{1}{u}=\frac{1}{f}\right]$ for a thin convex lens, using ray diagram for the formation of a real image by Convex lens.

With the help of labelled ray diagram, explain the formation of final image which is formed at least distance of distinct vision in case of astronomical telescope. Define its magnifying power and derive an expression for its magnifying power.