Answers

2016-03-01T06:27:52+05:30
U= -60

f =-40 

v =?

1/f = 1/v +1/u

v = uf / u-f
    = -60 × -40 /  -60 - (-40)
     = 240 /- 20
    = -12

0
but they have asked the position of the object so is it 60cm?