Calculations with Optical Instruments

Magnifying Glass

The more the glass is curved, the smaller is the focal length, the stronger is the magnification of the glass.

Magnification M:
Focal length f (cm):

M = 25 cm / f

Calculation of focal length and magnification of a magnifying glass. Conversion factor is the near point distance of the eye, which is estimated as 25 cm. This is not the distance of the glass from the object.

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