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A thin prism of angle $8^{\circ}$ produces a deviation of $4 ^{\circ} [\delta =4^{\circ}]$ What is the refractive index of the material of the prism.

$(a)\;1.5 \\ (b)\;1.0 \\ (c)\;2.5 \\ (d)\;0.5 $

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$\delta= A (\mu -1)$
$4=8 (\mu -1)$
$8 \mu=12$
$\mu =1.5$
Hence a is the correct answer.
answered Jan 17, 2014 by meena.p
 

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