Ask Dr. Universe: When eyes don’t focus on their own, lenses can correct the problem
Getting light to hit our retinas depends on different parts of the eye working together. First, the light goes through the ...
Hackaday5y
Creating Lenses On Cheap CNC Machines
Several other lenses are demonstrated, including a cylindrical convex lens, but these are only planoconvex lenses, or lenses that are flat on one side. Biconvex lenses can be constructed by gluing ...
Greek Reporter23h
Did the Ancient Greeks Have Telescopes?
Evidence suggests ancient civilizations, including the Greeks, may have had early optical knowledge and devices like ...
Hackaday6y
Adding Optics To A Consumer Thermal Camera
Creating the macro adapter is easy enough, you simply put a convex lens in front of the thermal camera. But telephoto is a bit more involved, and the rest of the whitepaper details the math and ...
PBS3y
Two Types of Telescopes
In his workshop in Padua, Italy, he discovered that plano-convex and plano-concave lenses worked best—that is, lenses with a plane on one side and curved surfaces on the other. Then, drawing on ...
BBC2y
Refraction and lenses
A lens is a specially shaped pieces of glass or transparent plastic, that is used to focus light. A convex lens is made from a transparent material that bulges outwards in the middle on both sides.