Q.

When a real object is placed at  25cm from a lens, a real image is formed. Mark the Incorrect statement from the following

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a

The lens is a converging lens

b

The image may be magnified or diminished

c

The focal length of the lens is less than  25cm

d

The focal length of the lens may be greater then  25cm

answer is D.

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Detailed Solution

Since a real image is formed, the light rays must converge after refraction from lens.Hence it is a converging lensThus the focal length is positiveFor formation of image of an object at distance 25cmFrom lens equation,  1v−1u=1f⇒1v−1−25=1f  ⇒1v=1f−125Since the lens in converging, v is positiveHence  f<25 cmMagnification = v−25 which may be greater than or less than 1 depending upon the focal length
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