Question

A convex lens has a focal length of 10cm.Where should the object be placed if the virtual image is to be 30cm from the lens.​

Answer 1

Answer:

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Answer 2

Answer:

f=10cm

v=30cm

u=?

1/v -1/u=1/f

1/u=1/f-1/f

1/u= 1/10-1/30

1/u=3-1/30

1/u=2/30

1/u=1/15 u= -15