First slide

The lens

Question

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

Moderate

A

4.5 cm
B

3.0 cm
C

0.75 cm
D

0.5 cm

Solution

$\frac{I}{O} = \frac{f - v}{f} \Rightarrow \frac{I}{+ 1 .5} = \frac{(25 - 75)}{25} = - 2 \Rightarrow I = - 3 cm$

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