The refractive indices of the crown glass for blue and red lights are 1.51 and 1.49 respectively, and those of?
the flint glass are 1.77 and 1.73 respectively. An isosceles prism of angle 6degree is made of crown glass. A beam of white light is incident at a small angle of this prism. The other flint glass isosceles prism is combined with the crown glass prism such that there is no deviation of the incident light. Determine the angle of the flint glass prism. Calculate the net dispersion of the combined system.
n = 9n(o) + n(r)]/2 = (1.51 + 1.49)/2 = 1.5
n' = (1.77 + 1.73)/2 = 1.75
A' = [-(n-1)A]/(n'-1)
= [-(1.5 - 1)6]/(1.75 - 1)
= - 4°
Dispersion = (n'(o) - '(r))
A' - (n(b) - n(r))
A = 0.04°
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