What principle is responsible for alternating light and dark bands when light passes through two or more narrow slits? what principle is responsible for alternating light and dark bands when light passes through two or more narrow slits? reflection refraction dispersion interference polarization

Interference

Explanation:

When two waves of same frequency and constant phase difference super impose at a point on the screen then due to their superposition we will get different intensity of light at different positions of the screen

This phenomenon of redistribution of energy is known as interference of light.

So at the position of screen where the light intensity is maximum on the screen is known as constructive interference while the positions on the screen where it will get minimum intensity on the screen is known as destructive interference of the light

So correct answer would be

Interference