Waves‎ > ‎

Light dispersion

convex lens 

How does the image formed because of the convex lens:

Red light is refracted the least when it enters the block, and violet light is refracted the most. This effect is called dispersion. However, this difference is corrected when the light leaves the block, so the effect is not noticeable.

Refraction of white light through a glass prism, which has sides that are not parallel, causes this difference in refraction of different colours of light to be exaggerated - so we see a spectrum of light emerging from the prism.