Diverging Lens or Concave Lens


 
 
Concept Explanation
 

Diverging Lens or Concave Lens

Concave lens is the lens which is thinner in the middle than the edge. A parallel beam of light falls on a concave lens as shown in the figure. After passing through the concave lens, the rays of light are diverging. Since, a concave lens diverges light rays falling on it, therefore, it is also called diverging lens.

Image formed by concave lens:

In the case of a convex lens, the nature of image formed depends on the distance of the object from the convex lens. But, this not followed in the case of a concave lens. In the case of a concave lens that whatever be the distance of an object from a concave lens, the image formed by a concave lens is always

(i) Virtual

(ii) Erect and

(iii) Smaller than the object (or diminished).

Uses of Concave Lens:

1. In order to see the image of the person standing outside, concave lenses are used in the peep holes in the door of hotels rooms.

2. Concave lenses are used in making spectacles.                   

Sample Questions
(More Questions for each concept available in Login)
Question : 1

A Match the entries given in Column - I with those in Column - II. 

Column IColumn II
a.  Plane mirror1.  Used as a magnifying glass
b.  Convex mirror2.  Can form images of objects spread over a large area
c.  Convex mirror3.  Used by dentists to see enlarged images of teeth
d.  Concave mirror4.  Image is erect and of the same size as the object
e.  Concave lens5.  The image is erect and smaller than the object
Right Option : A
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Explanation
Question : 2

The concave lens is also known as ____________________ .

Right Option : B
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Explanation
Question : 3

Which of the following are correct ?

(a) A concave lens diverges light rays falling on it, therefore, it is also called converging lens.

(b) The image formed by a concave lens is always virtual,erect and smaller than the object .

(c) Concave lenses are used in the peep holes in the door of hotels rooms.

Right Option : B
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Explanation
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