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Optics of lenses

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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...

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Solution Summary

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

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

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