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Find the dispersion produced by a thin prism of $18^{\circ}$ having refractive index fro red light $= 1.56$ and for violet light $=1.68$

$(a)\;5.67 \\ (b)\;1.92 \\ (c)\;3.24 \\ (d)\;2.16 $

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We know that dispersion produced by a thin prison $\theta = ( \mu_v -\mu _R)A$
Here $\mu_v =1.68, \mu_R=1.56$ and $A= 18^{\circ}$
$\theta= (1.68-1.56) \times 18^{\circ}$
$\qquad= 2.16$
Hence d is the correct answer.
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