Two prisms of identical geometrical shape are combined with their refracting angles oppositely directed. The materials of the prisms have refractive indices 1.52 and 1.62 for violet light. A violet ray is deviated by 1.0° when passes symmetrically through this combination. What is the angle of the prisms?

A thin prism is made of material having refractive indices 1.61 and 1.65 for red and violet light. The dispersive power of the material is 0.07. It is found that a beam of yellow light passing through the prism suffers a minimum deviation of 4.0° in favorable conditions. Calculate the angle of the prism.

The minimum deviations suffered by red, yellow and violet beams passing through and equilateral transparent prism are 38.4°, 38.7° and 39.2° respectively. Calculate the dispersive power of the medium.

Three thin prisms are combined as shown in figure (20-E1). The refractive indices of the crown glass for red, yellow and violet rays are μ_r, μ_y and μ_v respectively and

those for the flint glass are μ’_r, μ’_y and μ’_v respectively. Find the ratio A’A for which A there is no net angular dispersion, and B there is no net deviation in the yellow ray.

A thin prism of crown glass (μ_r=1.515, μ_v =1.525) and a thin prism of flint glass ((μ_r=1.612, μ_v =1.632) are placed in contact with each other. Their refracting angles are 5.0° each and are similarly directed. Calculate the angular dispersion produced by the combination.