Explain why a ray of light passing through the centre of curvature of a concave mirror gets reflected along the same path after reflection.

A ray passing through the principal focus of a concave mirror or a ray which is directed towards the principal focus of a convex mirror, is reflected back along the same path.

Explain why white light is dispersed while passing through a prism.

Give the geometry of reflection of an incident ray on a concave spherical mirror.

Torques of equal magnitude are applied to a hollow cylinder and a solid sphere, both having the same mass and radius. The cylinder is free to rotate about its standard axis of symmetry, and the sphere is free to rotate about an axis passing through its centre. Which of the two will acquire a greater angular speed after a given time?

Show with a neat diagram, the direction of the reflected ray in case of a concave mirror if the incident ray is : Passing through the focus.

Show with a neat diagram, the direction of the reflected ray in case of a concave mirror if the incident ray is : Passing through the centre of curvature.

What is the angle of reflection when a ray of light falls normally on a plane mirror?