A. 2.0cm
B. 3.3cm
C. 5.0cm
D. 10.0cm
E. 15.0cm
Correct Answer:
Option B – 3.3cm
Explanation
f = uv/(u+v)
5 = −10u/(−10+u)
50+5u = −10u
50 = −10u−5u
u = 50/−15
u= -3.3cm
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