Question

explain working of human eye please fast​

Answer 1

$\huge\textsf{Working\:Of\:Human \:Eye}$

• Light rays emitted by any object enter ⠀the eye, a small , real and inverted ⠀image of object is formed at retina. ⠀Sensory cells of retina are sensitized , ⠀and optics nerve carries this impulse ⠀brain. At this time animal is able to see object.

• Cornea, aqueous humor and biconvex lens Completely refract the light rays coming from object. As result the diameter of pupil according to light. Itris expands to Decrease the pupil in high intensity of light so a small amount of light touches the retina.

When light is din , iris itself constrict to increase the diameter of pupil.

The ability to change the focal lenght of lens by changing the Curvature of lens is called accommodation power.

• In normal condition Muscle fibers of ciliary body remain relaxed and lens is streched by its suspensory ligaments, and due to this lens is flat. A lens has more focal lenght . As a result of this eye can see long distant objects easily.

• To see near objects, sphincter Muscles of ciliary body becomes broad , suspensory ligaments becomes loose and relaxed . As a result of this ligament lens becomes biconvex , and now its focal length is reduced . Now animal is able to see near by object easily.

Refer to the Attachment .