Chapter 2 Flashcards
What is a “photon”?
A quantum of visible light or other form of electromagnetic radiation demonstrating both particle and wave properties.
What does it mean to “absorb”?
To take up something-such as light, noise, or energy-and not transmit it at all.
What does it mean to “scatter”?
To disperse something-such as light-in an irregular fashion. (Sometimes called diffracted.)
What does it mean to “reflect”?
To redirect something that strikes a surface-especially light, sound, or heat-usually back toward its point of origin.
What does it mean to “transmit”?
To convey something (e.g., light) from one place or thing to another.
What does it mean to “refract”?
- To alter the course of a wave of energy that passes into something from another medium, as water does to light entering it from the air.
- To measure the degree of refraction in a lens or eye.
What is an “image”?
A picture or likeness.
What is the “cornea”?
The transparent “window” into the eyeball.
What is “transparent”?
Allowing light to pass through with no interruption, so that objects on the other side can be clearly seen.
What is “aqueous humor”?
The watery fluid in the anterior chamber of the eye.
What is the “lens”?
The lens inside the eye that enables the changing of focus.
What is the “pupil”?
The dark, circular opening at the center of the iris in the eye, where light enters the eye.
What is the “iris”?
The colored part of the eye, consisting of a muscular diaphragm surrounding the pupil and regulating the light entering the eye u expanding and contracting the pupil.
What is “vitreous humor”?
The transparent fluid that fills the vitreous chamber in the posterior part of the eye.
What is the “retina”?
A light-sensitive membrane in the back of the eye that contains rods and cones, which receive an image from the lens and send it to the brain through the optic nerve.
