True/False Type Questions
Q Dispersive power of a prism decreases with the increase in prism angle.

True/False Type Questions Q A large-angle prism deviates a light ray more.

It is first face of a prism which disperses white light.

Statement 1: If two prisms of small apex angles are made of same material then prism of larger apex angle will produce more dispersion. Statement 2: Dispersive power of a prism is proportional to apex angle of prism.

How does the angle of deviation formed by a prism change with the increase in the angle of incidence ? Draw a graph showing the variation in the angle of deviation with the angle of incidence at a prism surface.

Assertion If angle of incidence in case of a prism is gradually increased, then deviation produced by prism will first decrease, then increase. Reason At minimum deviation, r_(1) =A/2 .

The angular dispersion produced by a prism

(a) How does the angle of deviation produced by a prism change with increase in the angle of incidence. Draw a curve showing the variation in the angle of deviation with the angle of incidence at a prism surface. (b) Using the curve in part (a) above, how do you infer that for a given prism, the angle of minimum deviation delta_("min") is unique for a given light.

How does the angle of minimum deviation produced by a prism change with increase in (i) the wavelength of incident light, and (ii) the refracting angle of prism ?

State whether the following statement is 'true' or 'false'. The deviation produced by a prism is independent of the angle of incidence and is same for all colours of light.

A prism of a certain angle deviates the red and blue rays by 8^@ and 12^@ respectively. Another prism of the same angle deviates the red and blue rays by 10^@ and 14^@ respectively. The prisms are small angled and made of different materials. The dispersive powers of the materials of the prisms are in the ratio