Question

when white light from a narrow slit falls on the face of a prism the light emerging from the prism is seen to split into different colour show it by drawing oppropriate labelled ray diagram
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Answer 1

Explanation:

When the white light is passed through the prism,the light will split in different component colours.This phenomenon of splitting of white light into its component colours is known "Dispersion"

Answer 2

To draw:

Labelled diagram of splitting of white light when it is incident on one of the face of the prism.

Diagram:

$\setlength{\unitlength}{1cm} \begin{picture}(1,0) \thicklines\qbezier(0,0)(0,0)(2,2)\qbezier(0,0)(0,0)(4,0)\qbezier(4,0)(2,2)(2,2)\put( - 0.29, 0.45){\line(2,1){1.6}}\put( - 0.29, 0.45){\vector(2, 1){1}}\put(1.2, 1.26){\line(1, 0){1.5}}\put( 1.2, 1.26){\vector(1, 0){0.9}}\put(2.7, 1.26){\line(1, 0){2.5}}\put(2.75,1.25 ){\line(6, -1){2.5}} \put(2.75,1.25 ){\line(5,-2){2.5}} \put(2.75,1.25 ){\line(4,-1){2.5}}\put(2.75,1.25 ){\line(3,-2){2.5}}\put(2.75,1.25 ){\line(5, - 3){2.5}}\put(2.75,1.25 ){\line(5,-4){2.5}}\put(5.5, -1.4 ){\line(0,1){3}}\put(7.2, -1.4 ){\line(0,1){3}} \put(5.7, 1.2 ){ \bf Red }\put(5.7, 0.8 ){ \bf Orange }\put(5.7, 0.4 ){ \bf Yellow }\put(5.7, 0){ \bf Green }\put(5.7, - 0.4 ){ \bf Blue }\put(5.7, - 0.8){ \bf Indigo }\put(5.7, - 1.2 ){ \bf Violet }\end{picture}$

Detailed Discussion:

• Whenever white light falls on one of the surface of the prism it undergoes refraction at the 1st interface.

• Now, each of the components of the white light undergo differential deviation at both the interfaces resulting in splitting of white light.

• This splitting is obtained in the screen as the visible spectrum.

• Violet light undergoes maximum deviation whereas red light undergoes minimum deviation.

Hope It Helps.