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At what angle, a ray of light should be ...

At what angle, a ray of light should be incident on the first face AB of a regular glass prism ABC so that the emergent ray grazes the adjacent face AC ?

Text Solution

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Using from figure ``sinr_(2)=(1)/(n)`
`sinr_(2)=(1)/(1.6)=0.625`
`r_(2)=38.68^(@)`
`r_(1)+r_(2)=60^(@)`
`r_(1)=60^(@)-38.68^(@)`
`r_(1)=21.32^(@)`
`n=(sini)/(sinr_(1))`
`sini=1.6xxsinr`
`sini=0.5817`
`i=35.57^(@)`
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