refractors
Lenses that redirect
Refractors are telescopes that use lenses rather than mirrors to gather and focus light.
The term distinguishes them from reflectors, which use curved mirrors.
A refractor bends (refracts) incoming light through a glass lens at the front of the tube to form an image at the eyepiece.
The design dates to the earliest telescopes and remains popular for amateur astronomy and terrestrial viewing.
Instrument magnifying faraway objects
- apertureAdjustable optical inlet
- lensLight-focusing curved glass
- achromaticLacking visible hue
- eyepieceLens you look through
objective · focal length · doublet · triplet · stargazing · celestial · observation · magnification
Light-splitting optical element
- spectrumContinuous range of values
- lightVisible electromagnetic radiation
- dispersionScattering across space
- glassTransparent solid from sand
wavelength · bending · angle · medium · index · transparent · physics · Newton
Medical specialty for eyes
- eye examinationAssessment of sight health
- retinoscopyObjective refraction measurement technique
- optometryEye and lens healthcare
- visionAbility to see
prescription · diopter · cornea · pupil · astigmatism · myopia · hyperopia · clinic
telescope
Instrument magnifying faraway objects
- apertureAdjustable optical inlet
- lensLight-focusing curved glass
- achromaticLacking visible hue
eyepiece · objective · focal length · doublet · triplet · stargazing · celestial · observation · magnification · mount
prism
Light-splitting optical element
- spectrumContinuous range of values
- lightVisible electromagnetic radiation
- dispersionScattering across space
glass · wavelength · bending · angle · medium · index · transparent · physics · Newton · rainbow
ophthalmology
Medical specialty for eyes
- eye examinationAssessment of sight health
- retinoscopyObjective refraction measurement technique
- optometryEye and lens healthcare
vision · prescription · diopter · cornea · pupil · astigmatism · myopia · hyperopia · clinic · diagnosis
- Telescope Geartelescopes, reflectors, mounts, eyepieces, tripods
- opticslens, lenses, mirror, mirrors, prism
- refractory periodInterval blocking repeated activation