a) With the help of a labelled diagram, explain how a concave lens diverges a beam of parallel light rays. Mark the princple axis, optical center, principle focus and focal length of the convex lens on the diagram.
b) State whether concave lens and convex lens mirror have in common.

a) With the help of a labelled diagram explain how a convex lens converges a beam of parallel light rays. Mark the principle axis, optical center, principal focus and focal length of the convex lens on the diagram. b) State whether convex lens has a real focus or a virtual focus. c) List some things that convex lens and concave mirror have in common.

a) Explain with the help of a digaram, why the convex lens is also called a converging lens. b) Define principle axis, principle focus and focal length of a convex lens.

Describe with a suitable diagram, how a convex mirror diverges a parallel beam of light rays. Mark clealy the polw, focus and cente of curvature of convex mirror in this diagram.

Explain with a suitable diagram, how a concave mirror converges a parallele beam of light rays. Mark clearly the pole, focus and centre of curvature of concave mirror in this diagram.

State the rules to draw a ray diagram for a concave lens.

a) Explain with the help of a diagram, why the concave lens is also called a diverging lens. b) Define the principle focus of a convex lens.

Concave lens : Negative focal length :: convex lens …………..

Which of the two diverges a beam of parallel rays of light : convex lens or concave lens ?

Concave lens:Negative focal length:: Convex lens:____.