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Summary

Interference ...

Question

Interference of light from two sources can be observed if

A

The sources are independent.

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B

The sources are of different frequencies and random phases.

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C

The sources are of different frequency.

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D

The sources are coherent.

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Solution

The correct option is D The sources are coherent.
Interference of light from two sources can be observed if the sources are coherent . It means that the phase difference between two sources must be constant with time . Two independent sources can't produce an interference pattern .

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Similar questions

Q. The necessary conditions for a steady and stable interference pattern, produced by two sources of light, are,

(i)

two light sources must emit waves of equal frequency

(i i)

two point sources should have the same amplitude

(i i i)

two sources must have constant phase difference

(i v)

two sources must be close to each other

Q. Assertion :Only coherent light sources produce sustained interference. Reason: Coherent light sources emit lights of same wavelength and with a constant phase difference.

Q. Assertion :Two coherent point sources of light having non-zero phase difference are separated by a small distance. Then, on the perpendicular bisector of line segment joining both the point sources, constructive interference cannot be obtained. Reason: For two waves from coherent point sources to interfere constructively at a point, the magnitude of their phase difference at that point must be

2 m π

m

is a non-negative integer).

What are the coherent sources of light and why do we need coherent sources for the production of interference pattern ?

Q. Assertion :Assertion : Interference is not observed if the two coherent slit sources are broad. Reason: Reason : A broad source is equivalent to many narrow slit sources.

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