Question

An object is placed at a distance of 20cm from a convex lens of focal length 15cm determine the magnification.​

Answer 1

Answer:

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Answer 2

The magnification of the convex lens is -3.

Explanation:

Given that,

Object distance, u = -20 cm

Focal length of the convex lens, f = +15 cm (it is positive for convex lens)

Let v is the position of the image. It is given by using lens formula as :

$\dfrac{1}{f}=\dfrac{1}{v}-\dfrac{1}{u}$

$\dfrac{1}{v}=\dfrac{1}{f}+\dfrac{1}{u}$

$\dfrac{1}{v}=\dfrac{1}{15}+\dfrac{1}{(-20)}$

v = 60 cm

The magnification of the lens is given by :

$m=\dfrac{v}{u}$

$m=\dfrac{60}{-20}$

m = -3

So, the magnification of the convex lens is -3. Hence, this is the required solution.

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Lens formula

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