In case of Concave mirror proof that r=2f .
explain please..
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yus .. its 2times focallength
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ɧơ℘ɛ ıɬ ῳıƖƖ ɧɛƖ℘ ყơų.
ɱąཞƙ ąʂ ცཞąıŋƖıʂɬ.
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