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Q.

A linear object of height 5 mm is placed on the principal axis of a concave lens of focal length 20 cm at a distance of 20 cm from the lens and the object is perpendicular to the principal axis. Then size of its image is

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a

0.5 mm

b

7.5 mm

c

2.5 mm

d

4 mm

answer is C.

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Detailed Solution

1V−1(−20)=1(−20)⇒V=−10 cm∴ size of imagesize of object=Vu=−10−20⇒ size of image = 5×12=2.5 mm
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A linear object of height 5 mm is placed on the principal axis of a concave lens of focal length 20 cm at a distance of 20 cm from the lens and the object is perpendicular to the principal axis. Then size of its image is