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Asked by aditir | 6th Jul, 2009, 11:19: PM

Expert Answer:

m = 3; R = 36 cm; f = - 18 cm; u = ?

since m = - v / u

3 = - v / u

v = - 3 u

using (1/f) = (1 / v) + (1 / u)

(1 / -18) = (1/ v) - (3 / v)

(1 / -18) = -2/3v

v = 12 cm

Answered by  | 7th Jul, 2009, 10:50: AM

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