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  • A needle 4 cm high is placed in front of a lens. Image of the needle is real, inverted and 6 cm high, when the distance between the needle and its image is 20 cm. find the focal length of lens and also write the type of the lens.

A needle 4 cm high is placed in front of a lens. Image of the needle is real, inverted and 6 cm high, when the distance between the needle and its image is 20 cm. find the focal length of lens and also write the type of the lens.

Answers (1)

We know m=hi/ho=v/u

By lens formula

since, the focal length of the lens is positive, the lens used is a convex lens.

Posted by

shubham.krishnan

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