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Question

A 16 cm long image of an object is formed by a convex lens on a screen. On moving the lens toward the screen. a 9 cm long image is formed again on the screen. The size of the object is

A
9 cm
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B
11 cm
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C
12 cm
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D
13 cm
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Solution

The correct option is C 12 cm
Given,
y1=16cm
y2=9cm
The size of the object is,
y=y1×y2
y=16×9=4×3
y=12cm
The correct option is C.

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