1.

In an equilateral prism if incident angle is 45 then minimum deviation is……

Answer»

`30^@`
`60^@`
`45^@`
`90^@`

Solution :`i+e=A + delta`
But when `i=e IMPLIES delta=delta_m`
`therefore 2i=A+delta_m`
`therefore delta_m=2i-A=2 times 45^@-60^@=30^@`


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