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How does it work the test to discover the focal length of a pair of glasses?
Answer 1:

For convex classes, you use them to focus the sun's light onto a point and measure the distance from the glasses to that point. I'm not sure exactly how you would measure it for concave glasses - you'd need another (convex) lens. Your eye has such a lens, which is why glasses are useful, but I'd need to work out the geometry for how to do this.



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