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. - Physics


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.



Concept: Concave Lens
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Chapter 4: Refraction through Lenses and Optical Instruments - Figure Based Short Answers


ICSE Class 10 Physics
Chapter 4 Refraction through Lenses and Optical Instruments
Figure Based Short Answers | Q 11


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

Show by drawing a ray-diagram that the image of an object formed by a concave lens is virtual, erect and diminished.

Give the position, size and nature of image of formed by a concave lens when the object is placed:
 anywhere between optical centre and infinity.

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  converging, 

 Construct ray diagrams to illustrate the formation of a virtual image using   a diverging lens.

What is the difference between the two images formed above? 

The power of a converging lens is 4.5 D and that of a diverging lens is 3 D. The power of this combination of lenses placed close together is :
(a) +1.5D
(b) +7.5D
(c) −7.5D
(d) −1.5D

What type of lens is used to correct 


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


A beam of light incident on a thin concave lens parallel to its principal axis diverges and appears to come from a point on the principal axis. Name the point. Draw a ray diagram to show it.

A lens forms an upright and diminished image of an object irrespective of its position. What kind of lens is this?

State two applications  a concave lens .

How will you differentiate between a convex and a concave lens by looking at (i) a distant object, (ii) a printed page?

The diagrams showing the correct path of the ray after passing through the lens are:


If the image formed by a lens is diminished in size and erect, for all positions of the object, what type of lens is it?

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.

 Express power of a concave lens of focal length 50 cm with its sign.

Can a concave lens form an image of size two times that of the object? Give reason?

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.

Define the principal focus of a concave lens.

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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