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Chapter 4

Light

TermDefinition
Transparent A material that transmits most of the light that strikes it.
Translucent A material that allows some light to pass through and scatters it.
Opaque A material that reflects or absorbs all of the light that strikes it.
Lens a curved piece of glass or other transparent material that refracts light.
Convex Lens Thicker in the center than at the edges.
Concave Lens Thinner in the center than at the edges.
Cornea Light enters the eye through the transparent front surface.
Pupil An opening through which light enters the inside of the eye
Iris A ring of muscle that contracts and expands to change the size of the pupil.
Retina A layer of cells that lines the inside of the eyeball.
Rods Are cells that contain a pigment that responds to small amounts of light. These cells allow you to see in dim light.
Cones Cells that respond to color
Optic Nerve The rods and cones send signals to the brain along this nerve.
Plane Mirror A flat mirror that produces an upright virtual image the same size as the object.
Concave Mirror A mirror with a surface that curves inward.
Convex Mirror A mirror with a surface that curves outward.
Focal Point The point at which light rays parallel top the optical axis meet, or appear to meet.
Optical Axis An imaginary line that divides a mirror in half
Created by: Bmacyscience
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