Optics questions This is a list of recently added questions about optics. Play optics quiz and see all the questions. Which organisms in nature can emit light?Firefly and honey fungus. Bioluminescence occurs widely in marine vertebrates and invertebrates, as well as in some fungi, microorganisms including some bioluminescent bacteria and terrestrial invertebrates such as fireflies. In some animals, the light is bacteriogenic, produced by symbiotic organisms such as Vibrio bacteria; in others, it is autogenic, produced by the animals themselves.Created by: Tschuka hard 47% firefly (insect)firefly (insect)2142honey fungus (mushroom)honey fungus (mushroom)129none of thesenone of these134firefly and honey fungusfirefly and honey fungus2145insects riddles » 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: Tschuka hard 43% Side rainbowSide rainbow23HaloHalo74Brocken spectreBrocken spectre88Sun DogsSun Dogs18mountains riddles » 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: Tschuka very hard 35% refraction of light in ice crystalsrefraction of light in ice crystals3386refraction in the lens of the eye or lensrefraction in the lens of the eye or lens2990refraction of light in water dropsrefraction of light in water drops2413reflections from the water surfacereflections from the water surface652atmosphere riddles » This is a rare phenomenon called iridescent clouds. It occurs in the clouds with ...Small droplets or ice crystals. The effect is similar to irisation. Iridescent clouds are a diffraction phenomenon caused by small water droplets or small ice crystals individually scattering light. Larger ice crystals do not produce iridescence, but can cause halos, a different phenomenon.Created by: Tschuka average 60% volcanic dustsvolcanic dusts2552sulphuric acidsulphuric acid2818detergent vaporsdetergent vapors2000small droplets or ice crystalssmall droplets or ice crystals11345sky riddles » 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: Tschuka very hard 35% Such people do not existSuch people do not exist336QuatroculusQuatroculus561ChromosomChromosom161TetrachromatTetrachromat584eyes riddles » 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: Ninjaihard 47% wearing sunglasses with UV filterwearing sunglasses with UV filter402wearing sunglasses without UV filterwearing sunglasses without UV filter4976not wearing sunglasses at allnot wearing sunglasses at all3781wearing sunglasses inside buildingswearing sunglasses inside buildings1334light riddles » 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: Ninjaivery hard 33% iridescenceiridescence607Rayleigh scatteringRayleigh scattering1715miragemirage625atmospheric refractionatmospheric refraction2215optical illusions riddles » 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: Ninjaihard 53% advectionadvection183iridescenceiridescence765rainbowrainbow187Morning GloryMorning Glory284clouds riddles » What kind of photos can be made with standard zoom lens mounted in the reversed position?Macro photography may be accomplished by mounting a lens in reverse, in front of a normally mounted lens of greater focal length. This method allows most cameras to maintain the full function of electronic and mechanical communication with the normally mounted lens, for features such as open-aperture metering.Created by: Shankar Kumaraverage 68% panoramicpanoramic2667nightnight867high-speedhigh-speed867macromacro9710lens riddles » The rainbow is violet on the inside of its arc. What color is it on the outside?Red. Visible light spans from red to violet. It is easy to remember, since wavelengths just outside the visible range are called infrared and ultraviolet.Created by: Hà Linh Chihard 55% blueblue3209greengreen1845yellowyellow3902redred11382colors riddles » Play optics quiz and see all the questions.