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From the graph fo angle of deviation del...

From the graph fo angle of deviation `delta` versus angle of incidwence `i`. Find the prism angle

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From the graph ,
`delta I + e - A`
`30^(@) = 30^(@) + 60^(@) - A`
`:. A = 60^(@)` ltbrZgt (Use the result : If `i` and `e` are interchanged then we get same value of `delta`)
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