1.

If the angle of a prism is 60° and angle of minimum deviation is 40°, then the angle of refraction will be ....

Answer»

`4^@`
`30^@`
`20^@`
`3^@`

Solution :For MINIMUM DEVIATION, `r_1 = r_2 = R` and prism angle
`A=r_1+r_2=r+r=2r`
`therefore r=A/2=(60^@)/(2)=30^@`


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