A short-sighted student can focus clearly on objects out to a far point of but no further

PHYSICS · Subjective · Fermi University Physics · Optics & Photonics · Geometrical optics and imaging · Geometrical optics and imaging

Optics and Photonics, Ch Stops, pupils and optical instruments

Problem

A short-sighted student can focus clearly on objects out to a far point of

2.50\ \text{m}

but no further. Using the thin lens equation

\dfrac{1}{s_o} + \dfrac{1}{s_i} = \dfrac{1}{f}

(real object distances

s_o > 0

, real image distances

s_i > 0

to the right), find the power, in dioptres, of the thin spectacle lens (worn close to the eye) that lets this student see very distant objects clearly.

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