Final answer:
The optical power formula P = 1/di + 1/do is used to calculate the power needed for vision correction, with distances converted to meters for accuracy.
Step-by-step explanation:
The formula mentioned relates to the physics of lenses and vision correction. This involves calculating the optical power (P) necessary for glasses or contact lenses to correct a person's vision. The formula P = 1/di + 1/do expresses the lens's power in diopters (D), which is the reciprocal of the focal length (f) in meters. To ensure clear vision, an image must be focused on the retina, with di (the image distance) being 2.00 cm for a normal eye. For distant vision, do is effectively infinity, while for close vision, do is 25.0 cm. It's essential to convert these distances into meters before using the formula.