An elderly sailor is shipwrecked on a desert island but manages to save his eyeglasses. The lens for one eye has a power of +1.18 diopte?
An elderly sailor is shipwrecked on a desert island but manages to save his eyeglasses. The lens for one eye has a power of +1.18 diopters, and the other lens has a power of +8.52 diopters. What is the magnifying power of the telescope he can construct with these lenses?
How far apart are the lenses when the telescope is adjusted for minimum eyestrain?
- David ELv 72 months ago
This is an optics question that those of us in the industry are no longer able to answer. We could when we were in school but we have forgotten because it doesn't matter. I can tell you that the powers for the glasses are not correct. Glasses come in 0.25 D steps. I can also tell you that an elderly sailors lenses are not going to make a very good telescope since they probably have bifocals in them.