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Telescopes in optics
Anatomy & Optics
Key Points
- •Galilean telescope: plus objective + minus eyepiece → erect image, narrow field, compact - used in surgical loupes and slit lamps
- •Keplerian telescope: plus objective + plus eyepiece → inverted image (needs erecting prism), wider field, longer tube - used in operating microscopes and high-mag loupes
- •Both telescopes are afocal systems - parallel light in, parallel light out; the secondary focal point of the objective coincides with the primary focal point of the eyepiece
- •Magnification: Galilean M = |F_eye| / F_obj; Keplerian M = F_eye / F_obj; tube length = f_obj + f_eye (algebraic sum)
- •The indirect ophthalmoscope functions as a reversed Galilean telescope with the patient's eye as the high-power component
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