Q2 of 10 Page 107

The nature of images formed by two lenses are given.

(i) An erect and magnified virtual image


(ii) An erect and diminished virtual image


(a) What type of lens is used in each case?

i. Convex lens will form erect and magnified virtual image.

Diagram of convex lens when object is place between the focus F and optical centre C.


q2.png


Here object is AB and its virtual image is A’B’. Image height is greater than object size (magnified) and image is upright (erect).


ii) Concave lens will form erect and diminished virtual image.


Diagram of concave lens when object is place between the infinity and optical centre C.



Here object is AB and its virtual image is A’B’. Image height is less than object size (diminished) and image is upright (erect).


More from this chapter

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1

Refractive indices of different materials are given. Find out through which medium light passes with maximum speed.

 2

The nature of images formed by two lenses are given.

(i) An erect and magnified virtual image


(ii) An erect and diminished virtual image


On using which of these lenses will we get an image having the same size as the object? What is the position of the object?

 3


(a) MN represents a lens. What type of lens is this?


(b) What are the characteristics of the image?


(c) Copy the ray diagrams in the science diary and complete it.

 4

What do you mean by power of a lens? What is the SI unit of the power of a lens? Calculate the power of a concave lens of focal length 25 cm.