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Question
List some things that concave lens and concave mirror have in common.
Solution
Few things which are common to both a concave lens and a convex mirror are as follows:
- Both diverge a parallel beam of light.
- Both form a virtual image at all times.
- Both have a virtual focus.
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RELATED QUESTIONS
Explain with the help of a diagram, why the concave lens is also called a diverging lens.
A small bulb is placed at the focal point of a converging lens. When the bulb is switched on, the lens produces:
(a) a convergent beam of light
(b) a divergent beam of light
(c) a parallel beam of light
(d) a patch of coloured light
What is the difference between the two images formed above?
Where will the image be formed if an object is kept in front of a concave lens at a distance equal to its focal length? Draw a ray diagram to illustrate your answer.
How will you differentiate between a convex and a concave lens by looking at
- a distant object,
- a printed page?
Draw neat diagram to show the
Divergent action of concave lens
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Inside water, an air bubble behaves ....................
When an object is kept within the focus of a concave mirror, an enlarged image is formed behind the mirror. This image is :
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(i) formed by a concave lens,
(ii) with a change in the position of the object?
Give two characteristics of the image formed by a concave lens.
