Question

what is the difference between interference and diffraction

Answer 1

Constructive interference occurs when the phase difference between the waves is a multiple of 2π, whereas destructive interference occurs when the difference is π, 3π, 5π, etc.Diffraction refers to various phenomena that occur when a wave encounters an obstacle.

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Answer 2

Hey !!

INTERFERENCE  

It is due to the superposition of two waves coming from two coherent sources.

The width of the interference bands is equal.

The intensity of all maxima ( fringes ) is same.

DIFFRACTION  

It is due to the superposition of secondary wavelets originating from different parts of the same wavefront.

The width of the diffraction bands is not the same.

The intensity of central maximum is minimum and goes on decreasing rapidly with increase in order of maxima.

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