Optical illusions questions This is a list of recently added questions about optical illusions. Play optical illusions quiz and see all the questions. 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 dusts2550sulphuric acidsulphuric acid2813detergent vaporsdetergent vapors1993small droplets or ice crystalssmall droplets or ice crystals11331sky 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 scattering1711miragemirage624atmospheric refractionatmospheric refraction2210light riddles » Which continent is that?Africa. This map of Africa is rotated so the continent shape resembles Australia.Created by: globalquiz.orghard 48% AustraliaAustralia8983AsiaAsia840AfricaAfrica9779North AmericaNorth America516continents riddles » Which continent is that?Australia. This is Australia map, with north at the bottom side.Created by: globalquiz.orgeasy 72% North AmericaNorth America3063South AmericaSouth America1071AsiaAsia4375AustraliaAustralia21904illusions riddles » How many dots at the intersections are black?None. In this scintillating grid illusion, dark dots seem to appear and disappear randomly. Various theories have been proposed to explain it. It may be caused by the mechanism of lateral inhibition (the capacity of an excited neuron to reduce the activity of its neighbors).Created by: Steve Lambertyvery easy 88% 10%10%31425%25%57650%50%1396NoneNone16992technology riddles » Which orange circle is larger?Both are the same size. This is known Ebbinghaus illusion. Although commonly thought of as an illusion of size, recent work suggests that the critical factor in the illusion is not the size, but the distance of the surrounding circles. In a similar way, the Moon appears larger on clear sky when it's close to the horizon line.Created by: globalquiz.orgvery easy 88% the one on the leftthe one on the left543the one on the rightthe one on the right2232both are the same sizeboth are the same size25427the first one you look atthe first one you look at654technology riddles » Whose face has been combined with Albert Einstein in this hybrid image?Marylin Monroe. A Hybrid Image is an optical illusion developed at MIT in which an image can be interpreted in one of two different ways depending on viewing distance. In order to see Marylin clearly, you need to move away of the screenCreated by: Cleoeasy 77% Kim BasingerKim Basinger710MadonnaMadonna1994Marylin MonroeMarylin Monroe20376Woody AllenWoody Allen3046technology riddles » How is this polygon called? (the one over the circles)Square. In this Ehrenstein illusion the sides of a square placed inside a pattern of concentric circles take an apparent curved shape. But in reality, the sides are straight.Created by: Debbie Foxeasy 74% squaresquare28461rhomboidrhomboid4143concave squareconcave square3282concave rhomboidconcave rhomboid2334geometry riddles » Which shape is larger?None of them. Both shapes are the same, but the bottom one is placed more to the right. This is however difficult to notice. It is known as Jastrow Illusion.Created by: globalquiz.orgaverage 67% AA969BB6109None of themNone of them23534Both are largerBoth are larger4344mathematics riddles » Which line is the longest?All are the same. This illusion has a long research history. It seems that people living in urbanized areas perceive the lines as representing the corners of rectilinear objects viewed in perspective, being more susceptible to illusion than people from rural areas.Created by: globalquiz.orgvery easy 86% AA790BB2020CC413All are the sameAll are the same21317technology riddles » Play technology quiz and see all the questions.