a) An object is placed 10 cm from a lens of focal length 5 cm. Draw the ray diagrams to show the formation of image if the lens is (i) converging, and ii) diverging.
b) State one practical use each of convex mirror, concave mirror, convex lens and concave lens.

State two differences between a convex lens and a concave lens. Give one use of convex lens and one of concave lens.

Draw ray diagram showing the image formation by a concave lens when an object is placed at the focus of the lens.

A point object is placed 60 cm in front of a convex lens of focal length 15 cm . A plane mirror is placed 10 cm behind the convex lens. Where is the image formed by the system ?

A convex lens of focal length 10cm and concave lens of focal length 20 cm are kept 5 cm apart. The focal length of the equivalent lens is

Draw ray diagram showing the image formation by a convex lens when an object is placed at the focus of the lens.

An object is placed at a distance of 40 cm from a convex lens of focal length 20cm. On the far side of the lens, a concave mirror of focal length 10cm is placed such that the distance of the object from the concave mirror is 100 cm. Then the final image which is formed after refraction from the lens, reflection from the mirror and again refraction from the lens, will be

A concave lens produces an image 20 cm from the lens of an object placed 30 cm from the lens. The focal length of the lens is:

A convex lens of focal length 15 cm is placed on a plane mirror. An object is placed 20 cm from the lens. The image is formed