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(a) A screen is kept at a distance of 1m...

(a) A screen is kept at a distance of 1m from the object. A converging lens between the object and the screen, when placed at any of the two positions which are 60cm apart, forms a sharp image of the object on the screen. Find the focal length of the lens.
(b) In the two positions of the lens, lateral size of the image is 4cm and 9cm. Find the size of the object.

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Let's break down the solution step by step for the given problem. ### Part (a): Finding the Focal Length of the Lens 1. **Understanding the Setup**: - The distance between the object and the screen is given as 1 meter (100 cm). - The lens can be placed in two positions that are 60 cm apart. ...
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