Refraction and the Lens-users Eq.

The same lens can be used as:

• a camera lens: s >> f, s > s’,

M < 0, |M| < 1

• a projector lens: s > f, s’ > s,

M < 0, |M| > 1

• a magnifying glass: s < f, s’ < 0,

  M > 0, M > 1
  

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