Question

To get a virtual image from a convex lens
having 6 cm focal length, the object dis-
tance u should be in between ?​

Answer 1

Answer:

Vm=vu=3  

v=3u

Formula corrected!!!

Also, Lens formula

1f=1v−1u

f=+6

Putting v= 3u,

1f=1v−1u

13u−1u=16

1u[13−1]=16

1u[−23]=16

−1u=1∗36∗(−2)=3−12=1−4

Thus:

u=−4

Object must be kept 4 cm away from the optical centre.

HOPE IT IS HELPFUL...

Answer 2

Answer:

at 0,-3 cm I think it's helpful to you