Illusions questions This is a list of recently added questions about illusions. Play illusions quiz and see all the questions. 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 crystals3369refraction in the lens of the eye or lensrefraction in the lens of the eye or lens2984refraction of light in water dropsrefraction of light in water drops2409reflections from the water surfacereflections from the water surface651atmosphere 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 dusts2550sulphuric acidsulphuric acid2813detergent vaporsdetergent vapors1993small droplets or ice crystalssmall droplets or ice crystals11331sky riddles » Which continent is that?Australia. This is Australia map, with north at the bottom side.Created by: globalquiz.orgeasy 72% North AmericaNorth America3065South AmericaSouth America1071AsiaAsia4377AustraliaAustralia21914continents 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%57750%50%1398NoneNone16996optical illusions 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% AA969BB6110None of themNone of them23538Both 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 » Which of the lines on the right, is the continuation of the black line on the left?Red one. This is known as Poggendorff illusion, first described in 1860. Many detailed studies of the illusion point to its principal cause: acute angles in the figure are seen by viewers as expanded.Created by: globalquiz.orghard 45% red onered one6123blue oneblue one2753none of themnone of them2698both of themboth of them1816technology riddles » Play technology quiz and see all the questions.