Mathematics, 26.02.2021 17:50 ingle75

For a 35mm camera, the equation 1/f=1/d+1/d represents the focal length (f) of the lens that is needed to produce a clear photograph. The distance from the lens to the film d1 must be adjusted according to the distance from the lens d0. If d1=x^2-4x-12 and d0=4x+8, what is 1/f?

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For a 35mm camera, the equation 1/f=1/d+1/d represents the focal length (f) of the lens that is need...

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