Question

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 1

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