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  2. Magnifying glass - Wikipedia

    en.wikipedia.org/wiki/Magnifying_glass

    Magnifiers are typically characterized using a "standard" value of 0.25 m. A magnifying glass operates as the simplest form of optical instrument. It is essentially a hand-held lens that converges light to produce an enlarged, upright image that appears to stand where light doesn't actually converge, known as a 'virtual' image.

  3. Loupe - Wikipedia

    en.wikipedia.org/wiki/Loupe

    A photographic loupe for examining film and prints. A loupe (/ ˈ l uː p / LOOP) is a simple, small magnification device used to see small details more closely. [1] They generally have higher magnification than a magnifying glass, and are designed to be held or worn close to the eye.

  4. Fresnel lens - Wikipedia

    en.wikipedia.org/wiki/Fresnel_lens

    Fresnel lenses are used as simple hand-held magnifiers. They are also used to correct several visual disorders, including ocular-motility disorders such as strabismus. [68] Fresnel lenses have been used to increase the visual size of CRT displays in pocket televisions, notably the Sinclair TV80. They are also used in traffic lights.

  5. Category:Optical devices - Wikipedia

    en.wikipedia.org/wiki/Category:Optical_devices

    Magnifiers (1 C, 14 P) Microscopes (1 C, 74 P) ... SMASH Handheld; Spatial light modulator; Spectro-Polarimetric High-Contrast Exoplanet Research; Spectrophotometer;

  6. Monocle - Wikipedia

    en.wikipedia.org/wiki/Monocle

    Joseph Chamberlain wearing a monocle. A monocle is a type of corrective lens used to correct or enhance the visual perception in only one eye.It consists of a circular lens placed in front of the eye and held in place by the eye socket itself.

  7. Traditional handheld refractometer - Wikipedia

    en.wikipedia.org/wiki/Traditional_handheld...

    A traditional handheld refractometer is an analog instrument for measuring a liquid's refractive index. It works on the critical angle principle by which lenses and prisms project a shadow line onto a small glass reticle inside the instrument, which is then viewed by the user through a magnifying eyepiece.

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