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Q.

A lens forms a virtual, diminished image of an object placed at 2 m from it. The size of image is half of the object. Which one of the following statements is correct regarding the nature and focal length of the lens?

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a

Concave |f| = 2 m

b

Concave |f| = I m

c

Convex |f| = 2 m

d

Convex |f| = 1 m

answer is C.

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Detailed Solution

m=ff+u,12=ff−2   or2f=f−2   or   f=−2  metref=2  metre

Since the image is virtual as well as diminished therefore the lens is concave.

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