Question

when an object is placed 20cm from a converging lens it produces two times magnified image which is obtained on a screen how far should an object be moved to obtain a virtual image of same magnification​

Answer 1

Explanation:

It is given that a convex lens of focal length

f=+20cm

m=+2

∵m=

u

v

v=2u..........(1)

Using lens formula

v

1

−

u

1

=

f

1

2u

1

−

u

1

=

20

1

u=−10cm

Hence, object is placed at a distance of 10 cm in front of lens.

Hope it would help uhh !!

Answer 2

Answer:

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