Question

Object is placed at 10 centimetre from the optical center of the lens having focal length 12 cm find the image distance

Answer 1

1/f = 1/v - 1/u

1/f + 1/u = 1/v

1/v = 1/12 + 1/-10

1/v = 1/12 - 1/10

1/v = (5-6)/60

1/v = -1/60

v = -60 cm

Hope this helps

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Answer 2

u didn't mentioned any particular lens
so I took the answer for both lenses
hope it helps....