Calculations with Optical Instruments

Lens | Magnifying Glass | Glasses | Microscope | Telescope, Binocular | Objective | Digital Camera | Monitor | Image Size | Print Size

Microscope

An optical microscope has two lense systems: at the top is the eyepiece, at the bottom is the objective. Between is the lens tube. By changing the lens tube length, the focus changes.

Magnification total:
Magnification objective:
Magnification eyepiece:

M_t = M_ob * M_ep

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Magnification objective:
Lens tube length (cm):
Focal length objective (cm):

M_ob = ltl / f_ob

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Magnification eyepiece:
Focal length eyepiece (cm):

M_ep = 25 cm / f_ep
See magnifying glass

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Calculate magnification, focal length and lens tube length of a microscope.

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