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A convex lens forms an image of an objec...

A convex lens forms an image of an object on a screen. The height of the image is 9 cm . The lens is now displaced until an image is again obtained on the screen. Then height of this image is 4 cm . The distance between the object and the screen is 90 cm.

A

The distance between the two positions of the lens is 30 cm.

B

The distance of the object from the lens is its first position is 36cm.

C

The height of the object is 6cm.

D

The focal length of the lens is 21.6 cm.

Text Solution

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The correct Answer is:
B, C, D
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