Question

A convex lens has focal length 5 m. At
what distance should an object be
placed so as to have a real image
magnified twice?​

Answer 1

it should be at 10 m please mark it as brainlist

Answer 2

Answer:

f=5m

m=2=v/u

so,v=2u

in lens

1/v-1/u=1/f

put v=2u

1/2u-1/-u=1/f

so 3/2u=1/5

so u=7.5cm ✓