CBSE Class 10 Answered
f = - 20 cm, m = 3, u =?
m = - v / u
3 = - v / u
v = - 3 u
using mirror formula
1/f = 1/v + 1/u
- 1/20 = - 1/3u + 1/u
-1/20 = 2 / 3u
u = - (40/3) cm
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