Lenses are thought to be made of several rectangularprismsstacked in a well-defined manner. In a convex lens, theyarestacked in such a way that their larger bases always facetowardsthe optical centre. But in a concave lens, the rectangularprismsare so arranged that their larger bases face away from theopticalcentre. The phenomenon of refraction is explained in boththe caseswith the help of these prisms. In this app, it has alsobeenexplained how real and virtual images are formed in the twotypesof lenses.
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Keywords: K12 content,refraction,lenses,convex,concave,thick,thin,optical centre,focallength,camera,eye,focus, 3d