Refracting angle of flint prism= Af = 6.0°
Refractive index of flint glass =μf = 1.620
Refractive index of crown glass =μc =1.518
Let the refractive angle of the crown prism be Ac.
For the net deviation of the mean ray to be zero,
Deviation by the flint prism = Deviation by the crown prism
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