Question

➡ A small object is so placed in front of a convex lens of 5 cm focal length that a virtual image is formed at a distance of 25 cm. Find the magnification. ​

Answer 1

Answer:

6

(1 \div f) = (1 \div v) - (1 \div u)

$(1 \div u) = -( 1 \div 25) -( 1 \div 5)$

$m = v \div u$

$= - 25 \div - ( 25 \div 6)$

$= 6$

Answer 2

Answer:

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Explanation:

Given,

Focal length,f = 5 cm ,

Image distance, v = -25 cm

Using the lens formula,

1/f =1/v - 1/u

or

1/5 = -1/25 - 1/u

On solving we get,

u=-25/6 cm

magnification, m=v/u

=-25/(-25/6)

=6

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