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In Figure, a monochromatic point source ...

In Figure, a monochromatic point source of light S is viewed by an observer O through a prism P. complete the diagram to show the image formed by the prism and as seen by the observer O. label the image by the letter I.

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The completed ray diagram is shown in figure. Two rays SA and SL from the source of light S, are incident on the prism. They are refracted along AB and LM respectively from the first face of the prism. The rays AB and LM again get refracted from the second face of the prism and emerge out of the prism along BC and MN respectively such that they appear to come from a point I. thus I is the image of the point source S. in other words, the observer O sees the source S raised to the position I.
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