First slide

The lens

Question

A convex lens forms a real image of an object for its two different positions on a screen. If height of the image in both the cases be 8 cm and 2 cm, then height of the object is

Moderate

A

16 cm
B

8 cm
C

4 cm
D

2 cm

Solution

$O = \sqrt{I_{1} I_{2}} = \sqrt{8 \times 2} = 4 cm$

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