A crown glass prism of angle 5° is to be combined with a flint prism in such a way
that the mean ray passes undeviated. Find (a) the angle of the flint glass prism
needed and (b) the angular dispersion produced by the combination when white
light goes through it. Refractive indices for red, yellow and violet light are 1.514,
1.517 and 1.523 respectively for crown glass and 1.613,1.620 and 1.632 for flint
glass.
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