the difference between convex and concave lenses. 2) What are the different lenses used for? 3) What kind of shape does the lens have in the eye? 4) Can you make a rule of thumb
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1) the difference between convex and concave lenses.
2) What are the different lenses used for?
3) What kind of shape does the lens have in the eye?
4) Can you make a rule of thumb
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