Question

How would the diffraction pattern of a single slit be affected when: (i) the width of the slit is decreased? (ii) the monochromatic source of light is replaced by a source of white light?

Answer 1

Interference and Diffraction are the phenomena that distinguish waves from particles: waves interfere and diffract, particles do not. Light bends around obstacles like waves do, and it is this bending which causes the single slit diffraction pattern.

Answer 2

Answer:

(i) The diffraction pattern becomes narrower if the width of the slit is decreased. (ii) A coloured diffraction pattern is obtained if monochromatic source is replaced by white light source. The central band is white therefore, the red fringe is wider than the violet fringe etc.