Question

Find the focal length of -10 cm .what type of lens is this

Answer 1

$\: hey........... \\ \\ p = \frac{1}{f} \\ \\ = \: \frac{1}{ - 10} \\ \\ = \: - 0.1 \: \\ since \: focal \: length \: is \: negative \: it \: is \: concave \: lens \: \\ \\ i \: think \: this \: helps \: you............$
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