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A beam of monochromatic light is inciden...

A beam of monochromatic light is incident at `i= 50^(@)` on one face of an equilateral prism, the angle of emergence is `40^(@)` , then the angle of minimum deviation is:

A

` 30 ^@ `

B

` lt 30 ^@ `

C

` le 30 ^@ `

D

` ge 30 ^@ `

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Verified by Experts

The correct Answer is:
B

Graph between ` ( delta -i) ` for prism
For the given condition
` delta = ( i+e-A) = 40 + 50 - 60 , delta = 30 `
Then ` delta _ (min ) lt delta , delta _ (min) lt 30 `
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