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

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Sample Questions
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Question : 1

An object is placed before a concave lens. The image formed:

Right Option : A
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Question : 2

Which of the following are correct ?

(a) Concave lens is the lens which is thinner in the middle that the edge.

(b) In a convex lens, the nature of image formed depends on the distance of the object from the convex lens .

(c) Concave lenses are used in making spectacles.

Right Option : D
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Question : 3

Which of the following are correct ?

(a) Concave lens is the lens which is thinner in the middle than the edge.

(b) Concave lenses are used in making spectacles.

Right Option : C
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Explanation
 
 
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