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Chapter 4
Light
Term | Definition |
---|---|
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 |