Take Down this Figure into Your Answer Book and Complete the Path of the Ray. - Science


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



The complete path of the light ray is as follows: 


Concept: Concave Lens
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Chapter 5: Refraction of Light - Exercise 5 [Page 252]


Lakhmir Singh Class 10 Physics (Science)
Chapter 5 Refraction of Light
Exercise 5 | Q 6 | Page 252


Due to gradual weakening of ciliary muscles and diminishing flexibility of the eye lens a certain defect of vision arises. Write the name of this defect. Name the type of lens required by such persons to improve the vision. Explain the structure and function of such a lens.

What type of image is always made by a concave lens?

Things always look small on viewing through a lens. What is the nature of the lens? 


An object lies at a distance of 2f from a concave lens of focal length f. Draw a ray-diagram to illustrate the image formation.

Which type of lens is 

 a diverging lens? Explain your answer with diagrams.

 State one practical use each of convex mirror, concave mirror, convex lens and concave lens.

The power of a concave lens is 10 D and that of a convex lens is 6 D. When these two lenses are placed in contact with each other, the power of their combination will be :
(a) +16 D
(b) +4 D
(c) −16 D
(d) −4 D

What kind of lens is used to correct 


A person finds difficulty in seeing nearby objects clearly. His vision can be corrected by using spectacles containing:
(a) converging lenses
(b) diverging lenses
(c) prismatic lenses
(d) chromatic lenses

Out of the two lenses, one concave and the other convex, state which one will show the divergent action on a light beam.

Study the following diagram :

Name the lens LL’

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 whether the following statement are ‘true’ or ‘false’ by writing T/F against them.

A concave lens, if kept at a proper distance from an object, can form its real image.

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 ............................

Write the SI unit of focal length of a concave lens.

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

name the lens.

Choose the correct alternative and rewrite the following: 

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

State three characteristics of the image of an extended source, formed by a concave lens.

Copy the following figure and complete it to show the formation of the image of the object AB. Name the lens used in the figure.

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

Draw images in case of a concave lens when the object is at any point on the principal axis between the lens and infinity.

Convex lens : converging : : concave lens : _______

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

Distinguish between Concave lens and Convex Lens.

Distinguish between:

Concave Lens and Convex Lens


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