1.

A ray of light suffers a minimum deviation when incident on a equilateral prism of refractive index sqrt2 . The angle of incidence is

Answer»

`30^(@)`
`45^(@)`
`60^(@)`
`50^(@)`

SOLUTION :`N=(SIN((A+D)/(2)))/(sin((A)/(2)))`
`sqrt(2)=((sin(60+D))/(2))/(sin""(60)/(2))`
`sqrt(2)=(sin((60+D)/(2)))/(sin30)`
`sqrt(2)xx(1)/(2)=sin((60+D)/(2))`
`=(60+D)/(2)=45`.
`60+D=90`
`D=30`
`2i=A+D`
`2i=60+30`
`i=(90)/(2)`
`i=45^(@)`


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