Shine a laser on the front wall and you will see a spot on the wall. Now bring a plastic scale its tapered part between the beam of light. The spot on the wall will shift. This is because of refraction. When light passes from a rare medium to a dense medium its velocity slows and it bends. It is because of this bending that the Spot shifts on bringing a plastic scale in between. The taper edge of the plastic scale acts like a prism. This work was supported by IUCAA and Tata Trust. This film was made by Asho
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