Physics, 04.08.2021 09:40 issaaamiaaa15

A certain projector uses a concave mirror for projecting an object image that is 5 times bigger than the object and the screen is 5m away from the mirror. So calculate the focal length of the mirror??

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A certain projector uses a concave mirror for projecting an object image that is 5 times bigger than the object and the screen is 5m away from the mirror. So calculate the focal length of the mirror??​

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A certain projector uses a concave mirror for projecting an object image that is 5 times bigger than the object and the screen is 5m away from the mirror. So calculate the focal length of the mirror??