Question

an object placed in front of a convex lens at a distance of 25 cm on principal axis. the focal length of the lens is 15 cm at what distance the image is formed?​

Answer 1

Answer:

37.5

Explanation:

u=-25cm

f=15cm

by lens formula

1/v-1/u=1/f

1/v=1/f+1/I

1/v=-25+15/15×25

v=375/10

v=37.5

Answer 2

The image will be formed at a distance of 37.5 cm.

Explanation:

We have,

Object distance from convex lens, u = -25 cm

The focal length of the lens, f = +15 cm

It is required to find the image distance. Using lens formula as :

$\dfrac{1}{v}-\dfrac{1}{u}=\dfrac{1}{f}\\\\\dfrac{1}{v}=\dfrac{1}{f}+\dfrac{1}{u}\\\\\dfrac{1}{v}=\dfrac{1}{(15)}+\dfrac{1}{(-25)}\\\\v=37.5\ cm$

So, the image will be formed at a distance of 37.5 cm.

Learn more,

Lens formula

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