Spherical Lenses|Lense|Two Types Of Lenses|Optical Centre and Principle Axis Of A Lence|Principle Focus And Focal Lenght Of A Convex Lens|Two Foci Of A Lens|Principle Focus And Focal Lenght Of A Concave Lens|Practice Exercise|Summary

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) 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.

What is a lens ? Name the two types of lenses. Name any five things which use lenses.

Focal length of a convex lense in air is 20cm. and of concave lens 40cm. Find the position of final 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.

A combination of two lenses with focal length 60 cm diverge the incident rays. Determine the power and nature of one lens if the other lens is convex and has a focal length of 60 cm.

The dispersive powers of glasses of lenses used in an achromatic pair are in the ratio 5 : 3. If the focal length of the concave lens is 15 cm , then the nature and focal length of the other lens would be

Rules For Obtaining Images Formed By Concave Lenses |Lens Formula|Magnification Produced By Lenses |Practice Exercise|Power Of A Lens|Power Of A Combination Of Lenses|Summary

Two convex lenses of focal length 10 cm each are combined. What will be the focal length of the combined lens ?