A. 10cm
B. 20cm
C. 25cm
D. 15cm
Correct Answer:
Option D – 15cm
Explanation
M = v/u = 3 = v/30. V = 30m
1/u + 1/v = 1/f = 1/10 – 1/30 = 1/f
(3−1)/30 = 1/f
f=(30/2) = 15cm
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