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A ray of light passes through an equilateral prism such that the angle of incidence is equal to the angle of emergence and each one is equal to $\large\frac{3}{4}$ th the angle of prism. Then angle of deviation is :

\[\begin {array} {1 1} (1)\;45^{\circ} & \quad (2)\;39^{\circ} \\ (3)\;20^{\circ} & \quad (4)\;30^{\circ} \end {array}\]
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answered Nov 7, 2013 by pady_1
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i + e = A+ d

i --->angle of incidence


A--->angle of prism

d---->angle of deviation

i=e= (3/4)A


1.5 A-A=d


A=60 degree (equilateral prism)

d=30 ..
answered Feb 3, 2016 by yuks.psbbm

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