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Shagun Vishwakarma 7 years, 2 months ago
m = v/u
3 = 6/u
u = 2
By lens formula
1/u - 1/v = 1/f
1/2 - 1/6 = 1/f
3 - 2/6 = 1/f
1/6 = 1/f
f = 6 cm
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