A. 2.5D
B. 5.0D
C. 10.0D
D. 25.0D
Correct Answer: Option C
C. 10.0D
Explanation
1/v=1/u
m = v/u=14=v/50
v = 12.5
But 1/v+1/u=1/f
= 1/50+1/12.5 = 1/f
f = 10m
P = 100/10=10D
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