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Lens Formula

A 9 cm high i...

Question

A 9 cm high image of an object is formed on a screen by a convex lens. When the lens is displaced towards the screen, again a 4 cm high image is formed on the screen. The height of the object is-

A

6 cm

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B

6.25 cm

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C

6.5 cm

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D

None of these

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Solution

The correct option is A 6 cm
According to displacement method height of object $= \sqrt{I_{1} I_{2}}$
$I_{1}$ and $I_{2}$ are height of image in two position of lens.

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