Question

For a convex lens of focal length 20 cm, where should an object be placed to get a virtual image?​

Answer 1

Answer:

Object should be placed at 15cm in front of the lens.

f=20cm

m=−2(red)

v=2u

Sign convention

u=−ve

v=+ve

f=+ve

Using lens formula,

v

1

−

u

1

=

f

1

⇒

−2u

1

−

u

1

=

f

1

→u=−

2

3f

=−

2

3×10

=−15cm

Object should be placed at 15cm in front of the lens.

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