# If the refracting angle of a prism is 60^@ and the minimum deviation is 30^@, then the angle of incidence is

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If the refracting angle of a prism is 60^@ and the minimum deviation is 30^@, then the angle of incidence is
A. 30^@
B. 60^@
C. 45^@
D. 90^@

by (84.0k points)
i=(A+delta_m)/(2)=(60^@+30^@)/(2)=45^@