The diagram given alongside shows a ray of light entering a rectangular block of glass:

1. Copy the diagram and draw the normal at the point of entry.
2. Draw the approximate path of the ray of light through the glass block and out of the other side.

Name the lens which always forms a virtual image of an object.

Why do we prefer a convex mirror as a rear-view mirror in vehicles?

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.

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.

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

If the object is moved further away from the mirror, what changes are there in the position and size of the image?

List four characteristics of the images formed by plane mirrors.

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

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