The necessary conditions for interference of light is:

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In interference the source of light should be monochromatic.

Here waves should be of the same frequency.

Direction of waves should also be the same.

All of the above

answer is D.

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Detailed Solution

Concept: In order to obtain a response, you may provide information about the colour of the light, slits, direction, and frequency of light utilised, among other things. This will fix your problem and provide you with the necessary circumstances.
Here we have to write for necessary conditions, we have to know the properties of light.
The following are the conditions for light interference.
(i) The light source in interference should be monochromatic.
(ii) The waves in this case should have the same frequency.
(iii) Wave direction should also be consistent.
(iv) The amplitudes of both waves must be the same.
(v) The incisions in both sources should be as narrow as possible.
Hence, the correct option is 4.

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