1.

Figure shows the graph of angle of deviation `del` versus angle of incidence `i` for a light ray striking a prism. The prism angle is A. `30^(@)`B. `45^(@)`C. `60^(@)`D. `75^(@)`

Answer» Correct Answer - B
`delta=30^(@)`
`delta=i+e-A`
`30^(@)=75^(@)-A`
`:. A=75^(@)-30^(@)=45^(@)`


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