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Optics of lenses

You are holding a lens in your hand. How can you tell if it is:

(a) positive (converging)

(b) negative (diverging), or

(c) neither (a) nor (b) above... draw pictures to show...

Solution Preview

I will try to keep the lens on top of the newspaper and focus it so that the object falls ...

Solution Summary

Optics of lenses are discussed. Diagrams of positive (converging), negative (diverging), or neither are given to help explain the solution.