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  • Give reasons for each of the following :  (a) The intensity of light at some points on the screen in Young’s double slit experiment is zero. (b) The intensity of light transmitted by a polaroid is less than the intensity

Give reasons for each of the following :

 (a) The intensity of light at some points on the screen in Young’s double slit experiment is zero.

(b) The intensity of light transmitted by a polaroid is less than the intensity of the unpolarised light incident on it.

(c) In the single slit diffraction experiment, some coloured fringes around the central white maximum are observed on the screen when one uses a source of white light.

 

 

 
 
 
 
 

Answers (1)

a) Due to the destructive interference of two waves.

b) When light is passed through a polaroid the vibrations of electric field vector which are perpendicular to the pass axis of the polaroid are absorbed and only those parallel to
pass axis pass, therefore the intensity of transmitted light is less than that of the incident light. 

c) At any point away from the central bright fringe, path difference is different for different colours, therefore maxima for different colours are formed at different points
and coloured fringes are observed. 

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