Download OPT 1155 Midterm Outline: History of Optics and Lens Properties and more Exams Advanced Education in PDF only on Docsity!
OPT 1155 Midterm Outline With Correct Answers!!
Ancient Egyptians -grasping images. ANSWER several possible explanation for light, including tentacles
Cave Men - ANSWER Light? Marco Polo -Also gave a description for the OG model of glasses ANSWER Noted the Chinese used emeralds and metal wires for sight.
Roger Beacon -the lens held toward the eye, rather than with the plane side toward the eye. ANSWER He noted that an image was clearer with the convex side of
Thomas Young - ANSWER Discovered astigmatism George Airy - ANSWER made the first cylinder lenses. Fra Giordano da Rivalto -of the art of sight and glasses ANSWER A pope who noted the importance and significance
Ben Franklin - ANSWER Bifocals Index of Refraction - ANSWER 1. Crown Glass - ANSWER · Most commonly used glass · Made of soda, lime, silica, and 70% sand · Similar to the best grade plate glass
· Potassium, Borax, and Arsenic added to improve the quality Flint Glass - ANSWER · Index of Refraction could be: 1.6, 1.7, 1. · Index of refraction (n) increases as % of lead oxide increases · Used briefly in Kriptok bifocals because of high fusibility ·heavy (dense), high index of refraction, low softening temperature, brittle, and not Characteristics include: high dispersion, sift (compared to crown glass), high luster, perfectly clear. Barrium Crown - ANSWER · Uses barium oxide · Lower rate of dispersion · Used in segments of higher quality bifocals with less dispersion than flint. CR-39 - ANSWER · N = 1. · Safe · Soft · Stable optics Clear white Polycarbonate - ANSWER · N = 1. · Safest · Very soft · Unstable optics · Slight grey tone Characteristics of a Plus Lens - ANSWER 1. Converges parallel light rays
- Focus light to a real focus
Biconcave or Double Concave - ANSWER both sides are concave (-/-). Plus Meniscus - ANSWER + side is greater than - side (cc curve is -6.00). Minus Meniscus - ANSWER - side is greater than + side (cc curve is +6.00). Plus Periscopic - ANSWER cc side is -1. Minus Periscopic - ANSWER cc side is +1. Lens -plane or curved, and functioning as part of our optical system. ANSWER any transparent medium, formed by two polished surfaces, either
Chromatic Aberration -the greater the chromatic aberration. ANSWER unwanted color in a lens. The higher the dispersion,
Geometric Center - ANSWER where boxed diagonals cross. Mechanical Center - ANSWER the point around which the lens is edged. Principal Axis - ANSWER imaginary line perpendicular to lens surface. Optical Center (OC) - ANSWER point on a lens where light travels straight through. Meridians - ANSWER imaginary lines from 0-180. Base Curve - ANSWER curve upon which other curves are determined.
Corrected Curve Lenses - ANSWER lenses designed using the optimum base curve. Spherical Lenses - ANSWER both lenses are spherical. Cylindrical Lenses - ANSWER lenses having one spherical, and one cylindrical surface. Posterior Focal Point - ANSWER back/secondary focal point. Anterior Focal Point - ANSWER front focal point. What contribution did Ben Franklin give to the optical profession? · Invented meniscus lenses · Invented periscopic lenses · Invented single-vision lenses · Invented bifocal lenses - ANSWER invented bifocal lenses The index of refraction of crown glass is: · 1. · 1. · 1. · 1.352 - ANSWER 1. All of the following are characteristics of minus lenses except: · Diverges light · Virtual focus · Thinner at center, thicker at the edges · Minify image
· Scratches easily · Good optics - ANSWER scratches easily CR-39 stands for Columbia Resin's 39th formula, and it is what we refer to as plastic. · True · False - ANSWER true The optical center is the point on a lens through which ray of light bends toward thebase. · True · False - ANSWER false
