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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