Calculate the angle of dispersion between red and violet colours produced by a flint glass prism of refracting angle of 600. Given μ_v = 1.633 and = μ_r 1.622.

Lightly falls from glass (μ = 1.5) to air. Find the angle of incidence for which the angle of deviation is 90^o.

What is the focal length of a convex lens (μ = 1.5) with radii of curvature R.

A double convex lens made of glass of refractive index 1.5 has both radii of curvature 20 cm each. Find the focal length of the lens. If an object is placed at a distance of 15cm from this lens, find the position of the image formed.

Draw and explain the image formation in spherical mirrors.