ABO Ophthalmology Complete Practice Exam 2025

Question: 1 / 400

A lens with a focal length of 0.5 meters has what power?

1D

2D

To determine the power of a lens, you use the formula for lens power, which is defined as the inverse of the focal length in meters. The formula is:

\[ \text{Power (D)} = \frac{1}{\text{Focal Length (m)}} \]

In this case, the focal length of the lens is 0.5 meters. Applying the formula:

\[ \text{Power (D)} = \frac{1}{0.5} = 2 \, D \]

Thus, the power of the lens is 2 diopters. This means that the correct answer is indeed 2D. Power measures how strongly the lens converges or diverges light, and a lens with a power of 2D indicates it is capable of bending light rays considerably over a short focal distance.

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