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Show that m=(f-v)/(f) for a lens. |
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Answer» SOLUTION :w.k.t. `(1)/(f)=(1)/(v)-(1)/(u)` By DEFINITION, `m=(v)/(u) and u=(v)/(m)` hence, `(1)/(f)=(1)/(v)-(m)/(v)` `(f-v)/(vf)=(m)/(v)` `thereforem=(f-v)/(f)` |
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