CBSE - X - Physics - The Human Eye and The Colourful World
prism and glass slab
With a prism, you will notice that they are never a regular shape. This is because when incident light enters it bends. All colors bend at different angles due to its own wavelength. When the light leaves the prism, the angle of the surface is different from the original one so the light gets bent again. Prisms are desingned to showcase the differnces in these refractions.
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