Question
Wed January 30, 2013 By:

An object placed 15 cm in front of lens forms a real image three times magnified. Where is the image formed? What is the focal length of the lens?

Expert Reply
Thu January 31, 2013
m= 3
u=-15cm
m= - v/u
v = - m * u
v =- 3 * (-15)
v =45 cm (real image)
i/f = 1/v - 1/u
1/f = 1/45- (-1/15)
1/f =1/45 + 1/15 
1/f = 4/45
f =45/4cm
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