Question

state two differences between interference and diffraction patterns.(2)

Answer 1

Interference is the result of overlapping two light waves coming from two different sources whereas diffraction is superimposition of waves occurring through same wave front.
2. Fringes in interference are perfectly dark nd bright while in diffraction fringes are neither perfectly dark neither perfectly bright

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.

Good luck !!