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Q.

An object of height 1.5 cm is placed on the axis of a convex lens of focal length 25 cm. A real image is formed at a distance of 75 cm from the lens. The size of the image will be

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a

4.5 cm

b

3.0 cm

c

0.75 cm

d

0.5 cm

answer is B.

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Detailed Solution

IO=f−vf⇒I+1.5=(25−75)25=−2⇒I=−3cm
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An object of height 1.5 cm is placed on the axis of a convex lens of focal length 25 cm. A real image is formed at a distance of 75 cm from the lens. The size of the image will be