Question

short note on optical illusion

Answer 1

An optical illusion (also called a visual illusion) is an illusion caused by the visual system and characterized by visually perceived images that differ from objective reality. The information gathered by the eye is processed in the brain to give a percept that does not tally with a physical measurement of the stimulus source. There are three main types: literal optical illusions that create images that are different from the objects that make them, physiological illusions that are the effects of excessive stimulation of a specific type (brightness, colour, size, position, tilt, movement), and cognitive illusions, the result of unconscious inferences. Pathological visual illusions arise from a pathological exaggeration in physiological visual perception mechanisms causing the aforementioned types of illusions.

Optical illusions are often classified into categories including the physical and the cognitive or perceptual,[1] and contrasted with optical hallucinations.

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Answer 2

Hope this helps you
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Optical illution is also difined as visual illution as it occurs beyond our expectations The information gathered by the eye is processed in the brain to give a percept that does not exactly catch with a physical measurement . The illusions are caused due to specific type of brightness, colour,size, position , etc . Merage is a good example of optical illusion especially occurs in deserts.
There are three main types - literal optical illusions that create images that are different from the objects that make them, physiological illusions that are the effects of stimulation and cognitive illusions, the result of unconscious references.