Convex lens : converging : : concave lens : _______ - Science and Technology 1

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Convex lens : converging : : concave lens : _______



Convex lens : converging : : concave lens : diverging

Concept: Concave Lens
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Chapter 7: Lenses - Find the correlation.


State whether concave lens has a real focus or a virtual focus.

A converging lens is used to produce an image of an object on a screen,object on a screen. What change is needed for the image to be formed nearer to the lens?

(a) increase the focal length of the lens
(b) insert a diverging lens between the lens and the screen
(c) increase the distance of the object from the lens
(d) move the object closer to the lens

 How would you alter the above diagram to show how a converging lens can produce a beam of parallel rays of light. 

 An object 2 cm tall stands on the principal axis of a converging lens of focal length 8 cm. Find the position, nature and size of the image formed if the object is:
(i) 12 cm from the lens
(ii) 6 cm from the lens
 State one practical application each of the use of such a lens with the object in position (i) and (ii). 

Take down this figure into your answer book and complete the path of the ray. 

Which type of lens is 

 a diverging lens? Explain your answer with diagrams.

An object is placed 10 cm from a lens of focal length 5 cm. Draw the ray diagrams to show the formation of image if the lens is  diverging.

When an object is placed 10 cm in front of lens A, the image is real, inverted, magnified and formed at a great distance. When the same object is placed 10 cm in front of lens B, the image formed is real, inverted and same size as the object. 

 What is the nature of lens B? 

Only one of the following applies to a concave lens. This is:
(a) focal length is positive
(b) image distance can be positive or negative
(c) height of image can be positive or negative
(d) image distance is always negative

Define the term principal foci of a concave lens and show them with the help of proper diagrams.


A ray of light, after refraction through a concave lens emerges parallel to the principal axis. (a) draw a ray diagram to show the incident ray and its corresponding emergent ray. (b) The incident ray when produces meets the principal axis at a point. Name the point.

The following diagram in given below shows an object OA and its virtual image IB formed by a lens.

An object is placed on the axis of a lens. An image is formed by refraction in the lens. For all positions of the object on the axis of the lens, the positions of the image are always always between the lens and the object.State three characteristics of the image.

State the changes in the position, size and nature of the image of an object when brought from infinity up to a concave lens. Illustrate your answer by drawing ray diagrams.

Explain the working of an astronomical telescope using refraction of light.


A student obtained clear image of window grills on the screen. But the teacher told him to get the image of a tree far away, instead of window. To get a clear image,  the lens must be ............................

A virtual diminished image is formed when an object is placed between the optical centre and the principal focus of a lens.

(i) Name the type of lens which forms the above image.
(ii) Draw a ray diagram to show the formation of the image with the above stated characteristics.

A lens always forms an image between the object and the lens. 

name the lens.

A concave lens forms an erect image of 1/3rd size of the object which is placed at a distance 30 cm in front of the lens. Find -

  1.  the position of image, and
  2. the focal length of the lens.

Choose the correct alternative and rewrite the following: 

Inside water, an air bubble behaves ....................

In figure give below of thin concave lens, F1 and F2 are its foci, complete the path of the given ray of light after it emerges out of the lens.

Draw images in case of a concave lens when the object is at infinity.

Convex magnifying glass is called divergent magnifying glass and concave magnifying glass is called converging magnifying glass.

If the power of a lens is -4.0 D, then it means that the lens is a ______.

Distinguish between Concave lens and Convex Lens.

Distinguish between:

Concave Lens and Convex Lens


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