Draw a ray diagram showing how a concave mirror can be used to produce a real, inverted and diminished image of an object.

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

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

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.

Which kind of mirror is used in the headlights of a car? Why is it used for this purpose?

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

A 4 cm tall object is placed on the principal axis of a convex lens. The distance of the object from the optical centre of the lens is 12cm and its sharp image is formed at a distance of 24cm from it on a screen on the other side of the lens. If the object is now moved a little away from the lens, in which way (towards the lens or away from the lens) will he have to move the screen to get a sharp image of the object on it again? How will the magnification of the image be affected?

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

Light travels more quickly through water than through glass:

1. Which is optically denser: Water or glass?
2. If a ray of light passes from glass into water, which way will it bend: Towards the normal or away from the normal?

Draw ray diagrams showing the image formation by a concave lens when an object is placed:
At the focus of the lens.