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Terms in this set (41)
Transparent material with at least one curved surface that causes light rays to refract, or bend.
A lens that bulges outward
A lens that curves inward and is thinner in the middle than at the edges
The point where all of the beams of light converge, or come together.
The distance from the center of the lens to the focal point.
Uses lenses to focus light and create useful images.
Uses several lenses to form an image on film or an electronic light sensor in digital cameras.
An optical instrument that makes far-away objects seems closer.
A combination of two convex lenses in a tube.
Which is enlarged by the smaller eyepiece lens.
The objective lens is replaced with a mirror that has a curved surface.
Uses convex lenses to make a small object appear larger.
The outer layer of the eye.
a convex lens that causes light rays to converge as they enter the eye.
The dark opening into the interior of your eye.
The colored part of the eye behind the cornea.
Attached to the lens change its shape.
A sheet of light-sensitive cells in the back of the eye.
Rods and Cones
The retina contains two types of cells
These chemical reactions produce nerve impulses that are transmitted to the brain.
A material used to change the color of other materials or objects.
People with color deficiency either lack green or red cones, or they have green or red cones that do not function correctly.
A person cannot see faraway objects clearly. In a nearsighted eye, the eyeball is too long for the lens to form a sharp image of distant objects on the retina.
A person cannot see nearby objects clearly. In a farsighted eye, the eyeball is too short for the lens to form a sharp image of nearby objects on the retina.
A wave that transfers energy from one place to another.
Light travels in narrow beams of light, in straight lines
Does not allow light to pass through.
Allows some light to pass through, but scatters light so you cannot see clearly through it.
Transmits almost all the light that strikes it, absorbing and reflecting very little.
Speed of Light
Light waves travel through empty space at a speed of about 300,000,000 m/s.
Refraction of light
Occurs when wave of light passes from one medium to another and the light wave is bent or refracted.
Index of Refraction
Indicates how much a material reduces the speed of light; the more light is slowed, the greater the index of refraction.
A piece of transparent glass or plastic that is usually shaped like a wedge.
The reflection off of smooth surfaces.
The reflection off of rough surfaces.
A smooth surface that reflects light to form images.
Images that are formed in locations where light does not actually reach.
Formed by curved mirrors. Such images are formed on the same side of the mirror as the object and light passes through the actual image location.
Flat, smooth mirror in which an image appears upright.
Mirror surface is curved inward; image depends on the location of objective relative to focal point.
Mirror curved outward. Light rays are diverged when reflected, showing virtual images.
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