4.2 Flashcards
branch of physics that relates to the properties of light and the function of vision.
Optics.
The ____________ of a human is composed of the eye, optic nerve, and certain parts of the brain.
Visual System
The organ that allows a human to sense light and produce electrical impulses that will be sent through the optic nerve to the brain.
Eye
The part of the visual system where the impulses are processed.
Brain
Rays of light pass through the transparent ______ of the eye and through an opening called the ______.
Cornea, pupil
The ______ surrounds the pupil and readjusts for the amount of light available.
Iris
A transparent ellipsoidal medium that changes thickness, allowing it to bend and focus rays of light entering the interior of the eye.
Lens
The lens _______ to focus rays of light from objects nearby and _______ to focus on light from distant objects.
thickens, narrows
Concentrates the rays of light on the retina
Lens
The _______ is composed of nerve cells with photoreceptors that are shaped like rods and cones
Retina
There are three different types of cone-shaped photoreceptors in the retina. Each type responds to which of the primary colors of light?
red, green, blue
It is the inability to distinguish colors
Color blindness
