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

Newton's rings are observed normally in reflected light of wavelength $5000 \stackrel{\circ }{\mathrm{A}}$. The diameter of the ${10}^{\mathrm{th} }$ dark ring is $0.005 \mathrm{m}$. The radius of curvature of the lens is

In interference experiment, intensity at a point is ${\left(\frac{1}{4}\right)}^{\text{th }}$ of the maximum intensity. The angular position of this point is at ($\cos 60°=0.5,\lambda =$ wavelength of light, $d=$ slitwidth)

In Young's double slit experiment, if the distance between two slits is equal to the wavelength of used light. Then the maximum number of bright fringes obtained on the screen will be

In a Fraunhofer diffraction at a single slit, if yellow light illuminating the slit is replaced by blue light, then diffraction bands

Two polaroids are placed $90°$ to each other and the transmitted intensity is zero. One more polaroid is placed between them bisecting the angle between them. Let $\mathrm{I}$ be the intensity of light just after the first polaroid. The fraction of I transmitted by the system is-

A parallel beam of fast moving electrons is incident normally on a narrow slit. A fluorescent screen is placed at a large distance from the slit. If the speed of the electrons is increased, then which of the following statements is correct?

The meaning of wavefront is:

The shape of wave front at a very large distance from source is ________.