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Lenses and Mirrors Science Unit

TermDefinition
beam a group of closely related rays. May also be used to mean one ray.
concave Hollowed or curved inward. The surface of a concave mirror or lens curves inward like the depression in a bowl.
converge to come together at a point.
convex bulging or curved outward. The surface of a convex mirror or lens bulges out like the outer surface of a ball.
cornea the transparent, rounded, outer surface of the eye that helps to focus light onto the retina.
diverge to spread apart.
farsighted able to see objects better from a distance than from close up.
focus to make an image clear. To cause rays to converge to a point, or to cause a lens or mirror to project an image.
hypothesis a preliminary explanation used as the basis for an experiment.
image the reproduction of an object formed by a lens or mirror.
iris the colored ring around the pupil that expands and contracts to control the amount of light entering the eye.
law of reflection a principle that states that a light ray is reflected by a flat mirror at the same angle at which it strikes the mirror.
lens a specially shaped piece of refractive material designed to change the way objects on one side of it look by changing the paths of light rays that pass through the material.
lens (in the eye) the transparent, convex body in the eye behind cornea and iris that helps to focus light onto the retina.
nearsighted able to focus on objects that are close up, but unable to see distant objects clearly.
optic disc the "blind spot" in the eye where the optic nerve connects to the retina.
optic nerve the thick cord of nerves that carries visual information from the eye to the brain, where it is interpreted.
pupil the opening in the eye through which light enters.
ray an imaginary straight line that represents the path light takes as it travels.
real image an image formed when light rays converge, so that it looks as if there were another objet at the place where the rays meet. Real images can be formed by only convex lenses and concave mirrors.
reflect to bounce off of a surface; to form an image of an object, as in a mirror.
refraction the bending or redirection of light rays at the point at which they travel from one substance into another
retina the inner layer of the eye, or "screen," onto which images are projected; is sensitive to light and passes information about the image through the optic nerve to the brain.
sclera the outer coating of the eye, commonly known as the "whites" of the eye.
Snellen eye chart a chart consisting of different sized rows of letter and used for testing eyesight.
variable any measurable or observable quantity that can change.
virtual image an image that results from a lens or mirror changing the paths of light rays so that they appear to come from somewhere beyond the lens or from within the mirror. Virtual images can be formed by all lenses and mirrors.
Created by: ctalley
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