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. 11.5.
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. Why does this happen?
✅Answer: The prism splits the incident white light into a band of 7 colours. They are Violet, Indigo, Blue, Green, Yellow, Orange and Red (VIBGYOR).