Question

If the real image of a candle flame formed by a lens is three times the size of the flame and the distance between lens and image is 80 cm, at what distance should the candle be placed from the lens?

Options

• -80cm

• -40cm

• `(-40)/3"cm"`

• `(-80)/3"cm"`

Answer 1

`-80/3"cm"`

Explanation:-

m = -3

V = 80cm

`m=v/u`

`-3=80/u`

`u=80/-3=(-80)/3"cm"`