2 cm long pin is placed perpendicular to the principal axis of a lens – InterviewSolution

1.	2 cm long pin is placed perpendicular to the principal axis of a lens of focal length 15 cm at a distance of 25 centimetres from the lens find the position of the image and its size. Why do we take the focal length as positive?
Answer» 2 cm long pin is placed perpendicular to the principal axis of a lens of focal length 15 cm at a distance of 25 centimetres from the lens find the position of the image and its size. Why do we take the focal length as positive?

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