A needle 4 cm high is placed in front of a lens. Image of the needle i – InterviewSolution

1.	A needle 4 cm high is placed in front of a lens. Image of the needle is real ,inverted and 6 cm high , when distance between the needle and its image is 20 cm. Find the focal leght of lens and also write the type if this lens.
Answer» A needle 4 cm high is placed in front of a lens. Image of the needle is real ,inverted and 6 cm high , when distance between the needle and its image is 20 cm. Find the focal leght of lens and also write the type if this lens.

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