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A small angled prism of refrative index ...

A small angled prism of refrative index 1.7 gives a deviation of `4.9^@`. The angle of prism is .......

A

`5^@`

B

`7^@`

C

`9^@`

D

`11^@`

Text Solution

Verified by Experts

The correct Answer is:
B
For prism of small prism angle,
`delta=A(n-1)` (n=1.7,`delta=4.9^@`)
`therefore 4.9^@=A(1.7-1)`
`thereforeA=(4.9^@)/(0.7^@)=7^@`
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