A flint glass prism and a crown glass prism are to be combined in such a way that the deviation of the mean ray is zero. The refractive index of flint and crown glasses for the mean ray are 1.620 and 1.518 respectively. If the refracting angle of the flint prism is 6.0°, what would be the refracting angle of the crown prism?

Question

Philoid · Accepted Answer

Given that,

Refracting angle of flint prism= A_f = 6.0°

Refractive index of flint glass =μ_f = 1.620

Refractive index of crown glass =μ_c =1.518

Now,

Let the refractive angle of the crown prism be A_c.
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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