Final answer:
The feature being examined by the physician is approximately 18.9 millimeters from her eyes, calculated by using the formula distance = 1 / power, where the power is 53.0 diopters.
Step-by-step explanation:
The power of a lens or an eye is given in diopters (D), which is the inverse of the focal length in meters (1 D = 1 m-1). To find the distance of an object being examined by the physician, we can use the simple relationship Distance (in meters) = 1 / Power (in diopters). With a power of 53.0 D, the distance from the physician's eyes to the object is calculated as follows:
Distance = 1 / Power
Distance = 1 / 53.0 D
Distance ≈ 0.0189 meters or 18.9 millimeters
Therefore, the feature being examined is approximately 18.9 millimeters from the physician's eyes.