Question

In which of the following the interference is produced by the division of wave front?
A. Young’s double slit experiment
B. Fresnel’s bi-prism
C. Lloyd’s mirror
 D. Colors of thin film

Answer 1

Hint: Fresnel’s experiment deals with two coherent sources of equal amplitude. Lloyd’s mirror experiment deals with reflection of light from a monochromatic slit source, and intends to prove wave nature of light. While in a thin film, the white light on both upper and lower surfaces split into various colors and interfere with each other. Young’s Double slit experiment, deals with interference patterns caused due to division of wave fronts of two monochromatic lights.

Complete step by step answer:
Young’s double slit experiment. When a monochromatic light is made to pass through two narrow slits, to illuminate a distant screen, it produces a characteristic pattern of bright and dark fringes. This ‘interference’ pattern is caused due to the superposition of light waves originating from the two slits. Wavefront from a one single source divides when it passes through two slits.

So, the correct answer is “Option A”.

Additional Information:
The young’s double slit experiment is a demonstration that light can demonstrate both wave and particle like characteristics. When the light is made to pass through narrow slits, it is diffracted into a semicircular wave. Pure constructive interference occurs where the waves are crest to crest or trough to trough

Note:
All the above given options may seem like they have similar concepts behind them. Hence make sure to distinguish between all the characteristic features of these experiments and phenomenon.Pure destructive interference occurs when they are crest to trough. We can only see this if the light fall onto a screen and is scattered into our eyes