Top 10 optics facts Selected as the most interesting among optics related questions in Optics quiz Which area is brighter?Both are the same. This is the well known checker shadow illusion, first published in 1995 by Edward H. Adelson, Professor of Vision Science at MIT. The area A appears darker because of its light surrounding. At the same time, area B, surrounded with dark areas, appear lighter.Created by: globalquiz.orgillusions facts » Why do cats have vertical pupils?To better see in the dark. The sharpest image is produced by round pupils, and if cats weren’t nocturnal, they probably would have round pupils like us. But the vertical pupil, in combination with horizontal eyelids, gives the cat greater and more accurate control in different types of lighting. A cat may adjust the amount of light by moving eyelids only.Created by: globalquiz.orgeyes facts » This optical phenomenon, appearing on misty mountainsides, is called...Brocken spectre. A Brocken spectre or mountain spectre, is the apparently enormous and magnified shadow of an observer, cast upon the surfaces of clouds opposite the sun. The head of the figure is often surrounded by the glowing halo-like rings of a glory—rings of coloured light that appear directly opposite the sun when sunlight meets a cloud of uniformly-sized water droplets. The phenomenon can appear on any misty mountainside or cloud bank.Created by: Tschukamountains facts » What is the name of this phenomenon?Iridescence is the phenomenon of certain surfaces that appear to gradually change colour as the angle of view or the angle of illumination changes. Examples of iridescence include soap bubbles, butterfly wings and sea shells, as well as certain minerals. It is often created by structural coloration (microstructures that interfere with light).Created by: Ninjaiclouds facts » In what process sky colors (including blue sky and red sun) are created?Rayleigh scattering, named after the British physicist Lord Rayleigh (John William Strutt), is an elastic scattering of light or other electromagnetic radiation by particles much smaller than the wavelength of the radiation. Created by: Ninjaioptical illusions facts » Which of the following is the worst for eyesight during a sunny day?Wearing sunglasses without UV filter. Wearing sunglasses witout UV filter causes the pupils to dilate and eyes to absorb more UV rays than they normally would without the sunglasses. Hence, it's much better not to wear sunglasses at all, than to wear ones without UV filter.Created by: Ninjailight facts » A person who has 4 types of color receptors is called ...Tetrachromat. Man is usually sensitive to about 500,000 colors. Tetrachromacy is the condition of possessing four independent channels for conveying color information, or possessing four types of cone cells in the eye. Organisms with tetrachromacy are called tetrachromats which can see up to 99 million shades. Created by: Tschukaanatomy facts » The bright circle around the Sun seen in the picture is known as a halo. What causes it?Refraction of light in ice crystals. Halo is the name for a family of optical phenomena produced by light interacting with ice crystals suspended in the atmosphere. Halos can have many forms, ranging from colored or white rings to arcs and spots in the sky. Among the best known halo types are the circular halo (properly called the 22° halo), Other common optical phenomena involving water droplets rather than ice crystals include the glory and the rainbow. Created by: Tschukaatmosphere facts » What kind of lens was most likely used for this photo?Fixed focal length. Such shallow depth-of-field is possible with lens of large aperture size (small f-number). The large aperture is a typical feature (and advantage) of a fixed focal length lens. The photo was taken with a 50mm f/1.4 lens. Created by: Debbie Foxlens facts » What kind of camera lens is that?Macro. Small front lens elements are typical for macro lenses.Created by: globalquiz.orgphotography facts » Play optics quiz and see all the questions.