State the rules to draw a ray diagram of a convex lens with proper figures.

State used of a convex lens.

State the rules used fro drawing ray diagrams for the formation of an image by a concave lens.

State the rules used for drawing ray diagrams for the fomation of an image by a convex lens .

Ray Diagrams OF Lens

A convex lens is used to focus the rays from the far off light bulb at a distance of one meter from the lens. What should be the focal length of the lens ? Draw a ray diagram to show the formation of image.

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.