B.Sc 1. Interference and diffraction of light 23-24

In Newton's Ring experiments , the diameter of bright rings is proportional to

• Natural numbers

• Square root of Odd Natural numbers

• Even Natural Number

• Square root of natural number

A wavelength is commonly measured in which one of the following units?

• Radians

• Angstroms

• Electron volts

• Seconds

What is the name of the process whereby waves travel around corners and obstacles in their paths?

• Reflection

• Refraction

• Interference

• Diffraction

In Fraunhofer diffraction, the incident wave front should be …..

• elliptical

• Plane

• Spherical

• Cylindrical

In Fresnel diffraction .....

• A. source of light is kept at infinite distance from the aperture

• B. source of light is kept at finite distance from the aperture

• C. Convex lens used

• D. aperture width is selected so that it can acts as a point source

color with a wavelength longer than that of yellow is:

• Red

• Blue

• Violet

• Green

A beam of white light is passed through a diffraction grating and the resulting spectrum is allowed to fall on a screen. Which one of the

following is the color of light that undergoes the greatest deviation from its original direction? Is it:

• A. Red

• B. yellow

• C. Blue

• D. violet

In reflected light the central fringes of Newton's ring is

• A. dark

• B. Bright

• C. Uniform

• D. Non uniform

On a rainy day, small oil films on water show brilliant colors'. This is due to

• A. dispersion

• B. interference

• C. diffraction

• D. Polarization

The fringe width and the angle of wedge are related to

• A. β=λ/2θ

• B. θ =λ/2 β

• C. β=λ/θ

• D. λ= β/2θ