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Questions
In a reading glass what is the position of the object with respect to the concave lens used?
Why can't we use the concave lens to position the object in the reading glass?
Solution
A concave lens is a diverging lens that constantly forms a virtual, diminished picture. Therefore, using it for magnification was not possible.
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RELATED QUESTIONS
Things always look small on viewing through a lens. What is the nature of the lens?
What is the difference between the two images formed above?
(a) Find the position and size of the virtual image formed when an object 2 cm tall is placed 20 cm from:
(i) a diverging lens of focal length 40 cm.
(ii) a converging lens of focal length 40 cm.
(b) Draw labelled ray diagrams to show the formation of images in case (i) and (ii) above (The diagrams may not be according to scale).
A person cannot see distant objects clearly. His vision can be corrected by using the spectacles containing:
(a) concave lenses
(b) plane lenses
(c) contact lenses
(d) convex lenses
Out of the two lenses, one concave and the other convex, state which one will show the divergent action on a light beam. Draw diagrams to illustrate your answer.
Give two characteristic of the image formed by a concave lens.
How will you differentiate between a convex and a concave lens by looking at
- a distant object,
- a printed page?
Do we expect any change in the position, nature, and size of the image
(i) formed by a concave lens,
(ii) with a change in the position of the object?
Convex magnifying glass is called divergent magnifying glass and concave magnifying glass is called converging magnifying glass.
Distinguish between:
Concave Lens and Convex Lens
