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

Explain with the help of a diagram, why the concave lens is also called a diverging lens.

State three characteristics of the image formed by a convex mirror.

Draw a ray diagram to show the formation of a real diminished image of an object by a convex lens. In your diagram, the position of object and image with respect to the principal focus should be shown clearly.

Briefly describe how you would find the focal length of a concave mirror quickly but approximately.

List some things that concave lens and convex mirror have in common.

When an object is placed at a distance of 15cm from a concave mirror, its image is formed at 10cm in front of the mirror. Calculate the focal length of the mirror.

An object is placed well outside the principal focus of a convex lens. Draw a ray diagram to show how.

An object is placed at a distance of 6cm from a convex mirror of focal length 12cm. Find the position and nature of the image.

List two properties of the images formed by convex mirrors. Draw ray diagram in support of your answer.