State whether the refractive index of a medium would increase or decrease if the angle of incidence is increased.

Define dispersion of light. How would you identify monochromatic light and composite light with the help of a prism? [1 + 2]

Write down the relationship between relative refractive index and absolute refractive index. On which factors does the relative refractive index of a medium depend? [1 + 2] OR Show that if a monochromatic light ray passes symmetrically through an equilateral prism then the angle of deviation of that ray will be minimum

Whether a concave lens is called a converging or diverging lens? Answer with reason.

A ray parallel to the principal axis of a concave mirror follows which path after reflection by the concave mirror?

Write one use of a convex mirror

In the case of refraction of white light through a prism, the light of colour which deviates the least is yellow orange red violet

If the refractive indices of a medium for red and blue colours of light are μr and μb respectively, which one is greater in magnitude?

Which type of mirror is used in the headlight of a motor car?

Is it possible to form a virtual image of shorter length than the length of the object by any mirror?

Dentists use (a) convex mirror (b) convex lens (c) concave mirror (d) concave lens

The wavelength of which of the following is greater than that of visible light? (a) x-ray (b) infrared ray (c) γ - ray (d) ultraviolet ray