Tag: physics

The iris gives eyes their color, depending on how much melanin it contains, similar to the pigment found in skin. Also helping to determine color is the iris's front layer, or stroma, which contains melanocyte cells that produce melanin, and fibers that scatter the light reflected outward.
Hence, the statement is false.

It is known as persistent of vision which is the time for which an image persists in our retina.

Sun spot cycle is a pattern observed in number of sun spots appearing every year due to revolution of earth arround sun with moon revolving earth.

Aqueous humor is low concentration protien liquid in eye lens.

The lens is a transparent structure behind the iris, the coloured part of the eye. The lens bends light rays so that they form a clear image at the back of the eye – on the retina. As the lens is elastic, it can change shape, getting fatter to focus close objects and thinner for distant objects.

The eyelens is adjustable focus double convex lens so that a real image is formed in retina.

Through a process called accommodation, this lens helps the eye automatically focus on near and approaching objects, like an autofocus camera lens. Light focused by the cornea and crystalline lens (and limited by the iris and pupil) then reaches the retina — the light-sensitive inner lining of the back of the eye.

cilliary muscles,contraction and relaxation changes the focal length of eye lens to focus the image of an object at varying distance.

Cone cells, or cones, are one of three types of photoreceptor cells in the retina of mammalian eyes(e.g. the human eye). They are responsible for color vision and function best in relatively bright light.

Human eyeball is spherical in shape. Its diameter is about 2.3 cm