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Dear student,
Refer below for above asked query:-
8. Optical illusion :- Optical illusion is an instance of deception by an object causing a false visual impression. For example, a mirage is an optical illusion caused by the bending of light rays in the layers of air of varying density.

9. Function of Oval window :-  It is a membrane-covered opening that leads from the middle ear to the vestibule of the inner ear.
It transmits vibrations from  tympanic membrane into the inner ear.

Function of Cochlea :- It transmits sound into neural impulses.

Function of Semicircular canals :- It maintains equilibrium of the body.

Function of Utricule :- It maintains linear acceleration and deceleration of the body.

Hope this information will clear your doubts about topic.

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