Question

An object is kept at a distance of 30 cm from a diving lens of focal
length 15 cm At what distance the image is formed from the
lens? find magnification of the image
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Answer 1

Explanation:

Distance to the left focal point (which is right of the lens for a negative lens) is 45cm. In focal lengths that is 3 focal lengths. Meaning that the magnification will be 1/3 and the image will be 1/3 focal lengths = 5cm from the right focal point (which is to the left of the lens for a diverging one). That is 10 cm from the lens on its left side.