10 most difficult illusions riddles A list of illusions related questions that are most often answered incorrectly Technology quiz 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. very hard 35% refraction of light in ice crystalsrefraction of light in ice crystals35%refraction in the lens of the eye or lensrefraction in the lens of the eye or lens31%refraction of light in water dropsrefraction of light in water drops25%reflections from the water surfacereflections from the water surface6%Created by: Tschuka . Statistics based on 9413 answers in 2 languages »atmosphere 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.hard 45% red onered one45%blue oneblue one20%none of themnone of them20%both of themboth of them13%Created by: globalquiz.org. Statistics based on 13390 answers in 4 languages »optical illusions 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.average 60% volcanic dustsvolcanic dusts13%sulphuric acidsulphuric acid15%detergent vaporsdetergent vapors10%small droplets or ice crystalssmall droplets or ice crystals60%Created by: Tschuka . Statistics based on 18687 answers in 2 languages »sky 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.average 67% AA2%BB17%None of themNone of them67%Both are largerBoth are larger12%Created by: globalquiz.org. Statistics based on 34956 answers in 4 languages »geometry riddles » Which lines are parallel?Green, blue and red. This is a well known Zöllner illusion, first described in 1860. It may be caused by this impression of depth. The black lines are parallel, too!average 69% blue and red onlyblue and red only4%green and red onlygreen and red only8%green, blue and redgreen, blue and red69%nonenone16%Created by: globalquiz.org. Statistics based on 21674 answers in 2 languages »technology riddles » 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.easy 72% AA8%BB12%Both are the sameBoth are the same72%It depends on the order of seeingIt depends on the order of seeing6%Created by: globalquiz.org. Statistics based on 20234 answers in 4 languages »optics riddles » Which continent is that?Australia. This is Australia map, with north at the bottom side.easy 72% North AmericaNorth America10%South AmericaSouth America3%AsiaAsia14%AustraliaAustralia72%Created by: globalquiz.org. Statistics based on 30413 answers in 2 languages »continents 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.easy 74% squaresquare74%rhomboidrhomboid10%concave squareconcave square8%concave rhomboidconcave rhomboid6%Created by: Debbie Fox. Statistics based on 38220 answers in 2 languages »mathematics 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 screeneasy 77% Kim BasingerKim Basinger2%MadonnaMadonna7%Marylin MonroeMarylin Monroe77%Woody AllenWoody Allen11%Created by: Cleo. Statistics based on 26126 answers in 4 languages »technology 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.very easy 86% AA3%BB8%CC1%All are the sameAll are the same86%Created by: globalquiz.org. Statistics based on 24540 answers in 2 languages »technology riddles » Play technology quiz and see all the questions.