HC Verma - Concepts of Physics Part 1

Book: HC Verma - Concepts of Physics Part 1

Chapter: 18. Geometrical Optics

Subject: Physics - Class 10th

Q. No. 56 of Exercises

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56

A pin of length 2.00 cm is placed perpendicular to the principal axis of a converging lens. An inverted image of size 1.00cm is formed at a distance of 40.0 cm from the pin. Find the focal length of the lens and its distance from the pin.

the image is formed at a distance from the object, -u + v =40cm

The height of the object, h0 = 2cm


The height of the image, h1= 1cm


The magnification is given by









Now, using lens maker’s formula,







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