In producing a pure spectrum, the incident light is passed through a narrow slit placed in the focal plane of an achromatic lens because slit.
A. produces less diffraction

B. increases intensity

C. allows only one color at a time

D. allows a more parallel beam when it passes through

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.

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?

The refractive index of a material M1 changes by 0.014 and that of another material M2 changes by 0.024 as the color of the light is changed from red to violet. Two thin prisms, one made of M1(A=5.3°) and the other made of M2(A=3.7°) are combined with their refracting angles oppositely directed. A Find the angular dispersion produced by the combination. B The prisms are now combined with their refracting angles similarly directed. Find the angular dispersion produced by the combination.

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.

In producing a pure spectrum, the incident light is passed through a narrow slit placed in the focal plane of an achromatic lens because slit.

By properly combining two prisms made of different materials, it is possible to