A convex lens has a focal length of 10 cm. At which of the following position should an object be placed so that this convex lens may act as a magnifying glass? (a) 15 cm (b) 7 cm (c) 20 cm (d) 25 cm

(b) 7 cm

Explanation

According to the properties of a convex lens, a convex lens casts a magnified image in the direction of object when the object is placed between the pole and focal length.

So, the object placed at 7 cm forms a magnifying image, because, except this, all values in options are greater than the focal length.

Hence, the object distance is 7 cm.

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Updated on: 10-Oct-2022

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