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


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?

When the object is placed at 2F in convex lens its image will be same size as the object. Here is the ray diagram:


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


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

 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.