Question

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At what distance should an object be placed from a convex lens of focal length 18 cm to obtain an image at 24 cm from it on the other side. What will be the magnification produced in this case?

Hoping for a well answer!

All the best :D"​

Answer 1

-1/3

Explanation:

Given,

f = 18cm, v = 24cm, then

we know that,

1/f = 1/v - 1/u

1/18 = 1/24 - 1/u

1/18 = 1/24 - 1/u

1/u = 1/24 - 1/18 = -1/72

u = -72

A/Q,

magnification = v/u

= 24/-72

= -1/3

Answer 2

Answer:

f = 18 cm

v = 24 cm

Lens formula : 1/v – 1/u = 1/f

1/24 – 1/u = 1/18

1/u = 1/24 – 1/18

1/u = (3 – 4)/72 = -1/72

u = -72 m

Explanation:

Hope it helps :)