What is the mirrors focal length

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Q. An object 12.0 cm tall is placed at the zero mark of a meterstick. A spherical mirror located at some point on the meterstick creates an image of the object that is upright, 4.00 cm tall, and located at the 43.0 cm mark of the meterstick. Where is the mirror? What is the mirror's focal length?

Q. The two springs each have a spring constant of 11.0 . They are stretched by 1.00 when a current passes through the wire. How big is the current?

Reference no: EM1345987

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