Power of Sun Glass

Aronyak

Please someone tell me why sun glasses have no power,though they are curved.......

CWatters

They do very slightly distort light but because both surfaces are curved and parallel and the material thin the effect is minimal. Like looking through a window.

Vanadium 50

You can get prescription sunglasses, which do have 'power'.

sophiecentaur

A lens works because of a difference in curvature between the sides. A curved sheet of glass with parallel sides is neither concave nor convex and does not act as a lens. This statement only really applies for relatively thin glass that isn't 'very' curved. Extremely thick / curved glass sheets will distort images, although they don't behave like simple lenses either.

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Aronyak	Power of Sun Glass Tweet Please someone tell me why sun glasses have no power,though they are curved.......

CWatters	They do very slightly distort light but because both surfaces are curved and parallel and the material thin the effect is minimal. Like looking through a window.

Vanadium 50 Mentor	You can get prescription sunglasses, which do have 'power'.

sophiecentaur Recognitions: Gold Member Science Advisor	Power of Sun Glass A lens works because of a difference in curvature between the sides. A curved sheet of glass with parallel sides is neither concave nor convex and does not act as a lens. This statement only really applies for relatively thin glass that isn't 'very' curved. Extremely thick / curved glass sheets will distort images, although they don't behave like simple lenses either.