Your eye contains a convex lens. Why is it unwise to look at the sun?

A communications satellite in orbit sends a parallel beam of signals down to earth. If these signals obey the same laws of reflection as light and are to be focussed onto a small receiving aerial, what should be the best shape of the metal 'dish' used to collect them?

How will you distinguish between a plane mirror, a concave mirror and a convex mirror without touching them?

List four specific characteristics of the images of the objects formed by convex mirrors.

Give two uses of a convex mirror. Explain why you would choose convex mirror for these uses.

Draw a diagram to represent a convex mirror. On this diagram mark principal axis, principal focus F and the centre of curvature C if the focal length of convex mirror is 3cm.

If an object is placed at a distance of 8cm from a concave mirror of focal length 10cm, discuss the nature of the image formed by drawing the ray diagram.

An object of height 4.0cm is placed at a distance of 30cm from the optical centre ‘O’ of a convex lens of focal length 20cm. Draw a ray diagram to find the position and size of the image formed. Mark optical centre ‘O’ and principal focus ‘F’ on the diagram. Also find the approximate ratio of size of the image to the size of the object.

A convex lens is immersed in a liquid of refractive index greater than that of glass. How will the nature of lens change?

Draw ray diagrams showing the image formation by a convex mirror when an object is placed:
At finite distance from the mirror.