Embibe Experts Solutions for Chapter: Wave Optics, Exercise 4: Exercise-4

Two monochromatic sources of electromagnetic wave, $P$ and $Q$ emit waves of wavelength $\lambda =20 \mathrm{m}$ and separated by $5 \mathrm{m}$ as shown. $A, B$ and $C$ are three points where interference of these waves is observed. If the phase of a wave generated by $P$ is ahead of wave generated by $Q$ by $\pi /2$ then (given intensity of both waves is $I$)

A telescope has an objective lens of $10 \mathrm{cm}$ diameter and is situated at a distance of one kilometre from two objects. What is the order of the minimum distance between these two objects, which can be resolved by the telescope ? (when the mean wavelength of light is given to be $5000 \stackrel{\mathrm{o}}{\mathrm{A}}$)

The angular resolution of a $10 \mathrm{cm}$ diameter telescope of wavelength of $5000 \stackrel{°}{\mathrm{A}}$ is of the order