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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`9cm`The lens is now disiplaced between the object on the screen.the height of this image is`4cm`.the distance between the object and the screen is `90cm`

A

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

B

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

C

The height of the object is 6 cm

D

The focal length of the lens is `21.6 cm`

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