Question

how can you show that white light (say sunlight) consists of seven colour

Answer 1

With the help of a narrow beam of light, a glass prism, and a white wall it is possible to produce the band of seven colors using white light. Keep this arrangement near the window. Place the glass prism in such manner that the sunlight through the window falls on one side of the prism and then on the white wall. You can see that the light reflected on the wall has several colors. The prism splits the white light into seven different colors. This splitting of white light into many colors is called as a dispersion of light. 

This shows that the sunlight consists of several colors. Sometimes in the rainbow, you may not see all the seven colors. This is because of the colors overlap each other. The degree of bending of the light’s path depends on the angle that the incident beam of light makes with the surface, and on the ratio between the refractive indices of the two media (Snell’s law) and results in splitting all the seven colors present in white light.

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Answer 2

Answer:

Place the glass prism in sunlight through windows falls on one side of crystal.The crystal parts the white light into seven colours. This will prove that sunlight consists of Synth colours.

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