what is meant by optical illusion
Answers
Optical illusions are images or pictures that we perceive differently than they really are. Put another way, optical illusions occur when our eyes send information to our brains that tricks us into perceiving something that does not match reality.
The word “illusion" comes from the Latin word illudere, which means “to mock."
Some optical illusions are physiological. This means that they're caused by some sort of physical means in the eyes or the brain.
The Mach band illusion is an example of a physiological illusion. The line in the middle of the picture is one solid color. However, because of how the eye's retina filters the different shades on either side of the line, the right side of the line appears darker, while the left side of the line appears lighter.
Other optical illusions are cognitive. Cognitive illusions, such as ambiguous, distorting and paradox illusions, occur when our brains automatically make assumptions based on the information sent from the eyes. These illusions are sometimes called “mind games."