The power of a convex lens of focal length 20cm is
A
0.05D
B
0.50D
C
5.00D
D
50.00D
Verified Correct Answer: C.
Step-by-Step Mathematical Solution
The Power is given by: P = \(\frac{1}{f}\)
f = 20cm → 0.2m
P = \(\frac{1}{0.2}\) = 5 dioptres
Source: WAEC / JAMB / NECO Classroom Archive (Record #70506)