Question

interference of light

Answer 1

When two light waves superpose with each other in such away that the crest of one wave falls on the crest of the second wave, and trough of one wave falls on the trough of the second wave, then the resultant wave has larger amplitude and it is called constructive interference.

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Answer 2

Hey!
here is your answer...

When two light waves from different coherent sources meet together, then the distribution of energy due to one wave is disturbed by the other. This modification in the distribution of light energy due to super- position of two light waves is called "Interference of light".

CONDITIONS FOR INTERFERENCE

The two sources of light should emit continuous waves of same wavelength and same time period i.e. the source

should have phase coherence.
The two sources of light should be very close to each other.
The waves emitted by two sources should either have zero phase difference or no phase difference.

COHERENT SOURCES

Those sources of light which emit light waves continuously of same wavelength, and time period, frequency and amplitude and have zero phase difference or constant phase difference are coherent sources.

TYPES OF interference

There are two types of interference.
Constructive interference. 
 Destructive interference.

CONSTRUCTIVE INTERFERENCE

When two light waves superpose with each other in such away that the crest of one wave falls on the crest of the second wave, and trough of one wave falls on the trough of the second wave, then the resultant wave has larger amplitude and it is called constructive interference.

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