Draw a ray diagram to show the path of the reflected ray corresponding to an incident ray which is directed towards the principal focus of a convex. mirror. Mark on it the angle of incidence and the angle of reflection.

Find the focal length of a lens of power – 2.0 D. What type of lens is this?

List four characteristics of the images formed by plane mirrors.

What is meant by:

1. Principal focus of a convex mirror.
2. Focal length of a convex mirror?

State the uses of plane mirrors.

Explain why, a real image can be projected on a screen but a virtual image cannot.

Draw ray diagrams showing the image formation by a concave mirror when an object is placed:Between focus and centre of curvature of the mirror.

To construct ray diagram we use two light rays which are so chosen that it is easy to know their directions after reflection from the mirror. List these two rays and state the path of these rays after reflection. Use these rays to locate the image of an object placed between centres of curvature and focus of a concave mirror.

What is the difference between a real image and a virtual image? Give one example of each type of image.

What do you understand by the power of a lens? Name one factor on which the power of a lens depends.