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• Take a thick sheet of cardboard and ma...

• Take a thick sheet of cardboard and make a small hole or narrow slit in its middle.
• Allow sunlight to fall on the narrow slit. This gives a narrow beam of white light.
• Now, take a glass prism and allow the light from the slit to fall on one of its faces as shown in Fig.
• Turn the prism slowly until the light that comes out of it appears on a nearby screen.
What do you observe? You will find a beautiful band of colours.

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