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Question
An object is viewed through a glass prism with its vertex pointing upwards. It appears to be displaced upward. Explain the reason.
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Solution
Let two rays OA and OL from a source O are incident on the prism. They are refracted along AB and LM from first face of the prism. These two rays again refract from the second face of the prism emerge out along BC and MN respectively such that they appear to come from I.
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