Why do different colours get separated when white light passes through a prism? How can we recombine the components of white light after a prism has separated them. Explain.

Why do different colours get separated when white light passes through

1.	Why do different colours get separated when white light passes through a prism? How can we recombine the components of white light after a prism has separated them. Explain.
Answer» Solution :A SPECTRUM is the band of distinct colours we obtain when the white light is splitted by a prism. We can recombine the component of white light by passing them through a prism placed upside down near the given prism. When we pass white light through two identical prisms held side by side with their refracting EDGES in opposite directions, the first prism DISPERSES white light but the second prism RECOMBINES them. Thus light EMERGING from second prism is white.