Question

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

Answer 1

Answer:

7cm

Explanation:

when object is placed within focal length of the lens its magnified virtual image is formed

Answer 2

The object distance is 7 cm.

(b) is correct option

Explanation:

Given that,

Focal length = 10 cm

We need to find the object distance

Using properties of convex lens

When the image is magnifying for convex lens it's mean the object is placed between the pole and focal length.

The object distance will be less than the focal length of the convex lens.

So, the object is placed at 7 cm then the magnifying image will be form.

All values in options is greater than the focal length.

Hence, The object distance is 7 cm.

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Topic : Optics

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