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Object location for mirrors

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For the following equations regarding mirrors, we want an object to appear three times larger using a concave mirror of radius R=30cm. Where is the object to be located? O = RI divided by 2I-R O= R- R-I divided by 3 all in brackets. Solve the above two equations for I and show the detail how I becomes the subject Attachments
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Mirrrors equation answer

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Substituting for I, which is I=-R,or I=-30cm, you get a... Attachments
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