Embibe Experts Solutions for Chapter: Wave Optics, Exercise 2: Exercise-2

A $TV$ tower has a height $150 \mathrm{m}$. What is the population density around the $TV$, tower if the total population covered is $50$ lakh ? (Radius of earth $=6.4\times {10}^6 \mathrm{m}$)

Two waves of same frequency and of intensity $I_0$ and $9I_0$ produces interference. If at a certain point the resultant intensity is $7I_0$ then the minimum phase difference between the two sound waves will be:

Assertion: The fringe width is inversely proportional to the distance between the two slits.

Reason: No interference pattern is detected when two coherent sources are infinitely close to each other.

Assertion: For best contrast between maxima and minima in the interference pattern of young's double slit experiment, the intensity of light emerging out of the two slits should be equal.

Reason: The intensity of interference pattern is proportional to square of amplitude.

Assertion: In Young's double slit experiment, the fringes become indistinct if one of the slits is covered with partially opaque paper.

Reason: The partially opaque paper decreases the wavelength of light.

Assertion: The unpolarized light and polarised light can be distinguished from each other by using Polaroid.

Reason: A Polaroid is capable of producing plane polarised beams of light.