A high school student studying optics finds that the focal length \(f\) of a lens is related to object and image distances by \( \frac{1}{f} = \frac{1}{d_o} + \frac{1}{d_i} \). If \(d_o = 30 \, \text{cm}\) and \(d_i = 60 \, \text{cm}\), what is \(f\) in cm?

Sat, 09 May 2026 02:58:42 +0000

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