Interference of Light and Young's Experiment

Which of the following figures represent is a double

slit interference pattern?

• A

• B

• C

• D

Interference of light is evidence that:

• (a) the speed of light is very large

• (b) light is a transverse wave

• (c) light is electromagnetic in character

• (d) light is a wave phenomenon

Laser Light is an example of a coherent source of light. The light emitted by the laser light has the same ________ and _____ .

For destructive interference, the path difference is:

• (a) odd number of half wavelengths

• (b) even number of half wavelengths

• (c) whole number of wavelengths

• (d) even whole number of wavelengths

2 sources of monochromatic light are said to be coherent, if light waves produced by them have the same:

• (a) frequency and constant phase difference

• (b) frequency only

• (c) amplitude and same wavelegth

• (d) amplitude only

Two independent light sources act as coherent sources.

• True

• False

If two coherent sources are vibrating in phase then we have constructive interference at any point P whenever the path difference is

• (a) (n+1/2)λ

• (b) nλ/2

• (c) (n-1/2)λ

• (d) nλ

If two sources are coherent, then the phase difference (􀁉) between the waves produced by them at any point

• (a) will change with time and we will have stable positions of maxima and minima.

• (b) will not change with time and we have unstable positions of maxima and minima.

• (c) Positions of will not change with time and we will have stable positions of maxima and minima.

• (d) will change with time and we will have unstable positions of maxima and minima.

When exposed to sunlight, thin films of oil on water of ten exhibit brilliant colours due to the phenomenon of