A. 17cm
B. 20cm
C. 25cm
D. 100cm
Correct Answer:
Option A = 17cm
Explanation
F = 20cm
V = 100cm
U = ?
1/U + 1/V = 1/F
1/20 + 1/100 = 1/F
5 + 1/100 = 1/F
F = 100/6
= 16.7cm
= 17cm
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