Question

explain the dispersion of Light​

Answer 1

The phenomenon of splitting of light into its component colours is called dispersion of light. When white light passes through a glass prism. It spreads out into a band of different colours called spectrum of light. The colours in the spectrum of light are Violet, Indigo, Blue, Green, Yellow, Orange and Red.

Answer 2

Dispersion of Light

Splitting of colour on passing through the place is known as Dispersion of light. Sir Isaac Newton carry out an experiment, He found that when the white light fall on prism more than 7 constituent colours on screen i.e. also called Spectrum of Light.

The Seven Colours are in the following order :-

• Violet
• Indigo
• Blue
• Green
• Yellow
• Orange
• Red

We Use a very popular meneonic code for remembering the patter of Spectrum known as VIBGYOR.

Cause of Dispersion

It is caused by the variation in the speed of light. the speed of light is directly proportional to the light . The maximum displacement in light is in Red colour while minimum is in Violet.

Recombination of Monochromatic Light -

Issac Newton carried out an experiment related to the combination of spectrum colour to give white light.

First He passed white light through a Prism in which white light disperse into Seven colours, again these seven colours pass through inverted prism.

The Seven Colours Recombined together and emerged out from prism becoming white light again.

This Show that white light is made up of seven colours .

Diagram shows Scattering of Light through a Prism :-

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