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4 results for “lens”

Formulae (4)

\frac{1}{f} = \frac{1}{v} - \frac{1}{u}

Relates focal length to object and image distances for a thin lens.

\frac{1}{f} = \frac{1}{d_o} + \frac{1}{d_i}

Relates focal length to object and image distances.

M = -\frac{d_i}{d_o}

Image size relative to object size.

P = \frac{1}{f}

Optical power in dioptres (f in metres).