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.

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

An object of height 2.5cm is placed at a distance of 15cm from the optical centre ‘O' of a convex lens of focal length 10cm. Draw a ray diagram to find the position and size of the image formed. Mark optical centre ‘O', principal focus F and height of the image on the diagram.

State the two laws of reflection of light.

Describe with the help of a ray-diagram, the size, nature and position of the image formed by a convex lens when an object is placed beyond 2f in front of the lens.

A lens is cut into two equal halves: Along the principal axis.
What will be the focallength of each half?

The diagrams show the appearance of a fork when placed in front of and close to two mirrors A and B, turn by turn.

1. Which mirror is convex.
2. Which mirror is concave.

Give reasons for your choice.

The focal length of a lens is +150mm. What kind of lens is it and what is its power?

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

“The magnification produced by a spherical mirror is - 3”. List four informations you obtain from this statement about the mirror/ image.