Name: Brewster’s Law
Uploaded: 2019-07-19
Duration: 6 min 57 s
Description: Light is a transverse electromagnetic wave with electric field vectors vibrating in infinite directions perpendicular to the direction of propagation. Let's...

Question

"Only white and dark fringes are obtained when white light is used in Young's double slit experiment.&rdquo; Is this statement true? Justify.

Accepted Answer

White light consists of waves of innumerable wavelengths starting from violet to red colour. Therefore, if monochromatic light in Young’s interference experiment is replaced by white light, then the waves of each wavelength from their separate interference patterns The resultant effect of all these patterns is obtained on the screen. Thus, the statement 'only white and dark fringes are obtained when white light is used in Young's double slit experiment' is false.
The central fringe will be white. As fringe width, i.e., wavelength increases in the order of colours denoted by VIBGYOR. That is the violet (V) fringe appears first and the red the last. After this, the fringes of many colours overlap at each point of the screen and so the screen appears uniformly illuminated.

"Only white and dark fringes are obtained when white light is used in Young's double slit experiment.” Is this statement true? Justify.

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