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An image of a bright square is obtained ...

An image of a bright square is obtained on a screen with the aid of a convergent lens. The distance between the square and the lens is 40cm. The area of the image is nine times larger than that of the square. Select the correct statement(s):

A

Image is formed at a distance of 120cm from the lens

B

Image is formed at a distance of 360cm from the lens

C

Focal length of the lens is 30cm

D

Focal length of the lens is 36cm

Text Solution

Verified by Experts

The correct Answer is:
A, C
`(v)/(u)=(3)/(1)rArrv=3u`
`(1)/(v)-(1)/(u)=(1)/(f),(1)/(3u)+(1)/(u)=(1)/(f)`
`f=30cm.`
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