1.

The angle of minimum deviation for a prism is 40^(@) and the angle of the prism is 60^(@). The angle of incidence in this position will be

Answer»

`30^(@)`
`60^(@)`
`50^(@)`
`100^(@)`

Solution :`anglei+anglee=angleA+angleD=60^(@)+40^(@)=100^(@)` and in MINIMUM deviation CONDITION `anglei=anglee`
`rArr""2anglei=100^(2) or anglei=50^(@)`


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