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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Concave |f| = I m

Convex |f| = 1 m

Concave |f| = 2 m

Convex |f| = 2 m

answer is C.

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Detailed Solution

m=ff+u,12=ff−2 or2f=f−2 or f=−2 metref=2 metreSince the image is virtual as well as diminished therefore the lens is concave.

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