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Question: A convex lens forms a real image of an object for its two different positions on a screen. If height...

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

A

16 cm

B

8 cm

C

4 cm

D

2 cm

Answer

4 cm

Explanation

Solution

By using O=I1I2O = \sqrt { I _ { 1 } I _ { 2 } } ⇒ O=8×2=4 cmO = \sqrt { 8 \times 2 } = 4 \mathrm {~cm}