8.0cm
16.0cm
24.0cm
32.0cm
Correct answer is D
F = 12cm, V = 3u F = \(\frac{uv}{u + v}\) 12 = \(\frac{u\times 3u}{u + 3v}\) u = 16cm, and v = 48cm therefore, distance between u and v v = 48 - 16 = 32cm
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