Question

Distinguish between the phenomenon of interference and diffraction of light.

Answer 1

Diffraction is the slight bending of light as it passes around the edge of an object. The amount of bending depends on the relative size of the wavelength of light to the size of the opening. Interference is a phenomenon in which two waves superpose to form a resultant wave of greater or lower amplitude
Diffraction requires an obstacle but interference does not.
The path of the wave stays intact after interference, but diffraction changes the path of the incident wave.