Double slit interference experiment is carried out with monochromatic light and interference fringes are observed. If now monochromatic light is replaced by white light; what change is expected in interference pattern?

Question

Double slit interference experiment is carried out with monochromatic light and interference fringes are observed. If now monochromatic light is replaced by white light; what change is expected in interference pattern? (A) No change (B) Pattern disappears (C) White and dark fringes are observed throughout (D) A few coloured fringes are observed on either side of central white fringe

Tardigrade Admin · Accepted Answer

Central fringe is white because all the wave lengths are super-imposing at central position with maxima. On either sides all wavelengths make their maximas and minimas so they appeared coloured.

Q. Double slit interference experiment is carried out with monochromatic light and interference fringes are observed. If now monochromatic light is replaced by white light; what change is expected in interference pattern?

No change

Pattern disappears

White and dark fringes are observed throughout

A few coloured fringes are observed on either side of central white fringe

Central fringe is white because all the wave lengths are super-imposing at central position with maxima. On either sides all wavelengths make their maximas and minimas so they appeared coloured.