In glass slab, the colours of spectrum recombine to their original direction of propagation while
emerging out. Prism have a different shape and varying thickness. So all colours cover a
different length of path and disperse. Explain the reason and draw a well labelled diagram to
illustrate this effect of two inverted prisms.
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Explanation:
Refraction of light through a glass prism
Refraction is the bending of light when it goes from one medium to another so, when a ray of light passes through a glass prism, refraction of light occurs both, when it enters the prism as well as when it leaves the prism. Since the refracting surfaces are not parallel, therefore, the emergent ray and incident ray are not parallel to one another. In this case the ray of light is deviated on passing through the prism.
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