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For an equilateral prism, it is observed...

For an equilateral prism, it is observed that when a ray strikes grazingly at one face it emerges grazingly at the other. Its refractive index will be

Text Solution

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`i_1=i_2=90^@`
`r_1=r_2=A/2=30^@ implies mu= (sin i_1)/(sin r_1)=2`
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