A. 2.5 cm
B. 25.0 cm
C. 40.0 cm
D. 80.0 cm
Correct Answer:
Option D = 80.0 cm
Explanation
The power of a lens is defined as the reciprocal of its focal length in metres:
P = 100/f → 2.5 = 100/f
where P is the power in diopters and f is the focal length in metres.
2.5 * f = 100
f = 100/2.5
f = 40
Where f = r/2
radius of the curvature[r] = f * 2 → 40 * 2
r = 80cm
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