The optical power of the glasses is respectively equal to 1.25 diopters, 2 diopters, 4 diopters.

The optical power of the glasses is respectively equal to 1.25 diopters, 2 diopters, 4 diopters. What is the focal length of these lenses?

The optical power of the lenses of the glasses can be calculated using the formula:
D = 1 / F, where D is the optical power of the glasses lens (diopters), F is the focal length of the glasses lens (m).
D1 = 1.25 diopters, D2 = 2 diopters, D3 = 4 diopters ..
Let’s calculate the focal lengths of the lenses of the glasses:
F1 = 1 / D1 = 1 / 1.25 = 0.8 m.
F2 = 1 / D2 = 1/2 = 0.5 m.
F3 = 1 / D3 = 1/4 = 0.25 m.
Answer: The focal lengths of the lenses of the glasses are respectively equal to 0.8 m; 0.5 m; 0.25 m.