TEKS: P.8D Light

Luminous source

• An object that emits light, such as the Sun or a lightbulb.

• An object that absorbs light and reflects it.

• An object that produces sound waves.

• An object that generates heat without emitting light.

Ray model of light

• A model that represents light as a wave that travels in a curved path.

• A model that represents light as a ray that travels in a straight path, whose direction can be changed only by encountering a boundary.

• A model that describes light as a particle that can only travel in a vacuum.

• A model that shows light as a beam that can be absorbed by different materials.

Translucent

• A property that allows a medium to transmit light and reflect a fraction of the light, preventing objects from being seen clearly through it.

• A property that allows a medium to completely block light, making it impossible to see through.

• A property that allows a medium to reflect all light, making it appear shiny and bright.

• A property that allows a medium to absorb all light, making it appear dark.

Transparent

• A property of a medium that allows it to transmit light and reflect a fraction of the light, allowing objects to be seen clearly through it.

• A characteristic of a medium that absorbs all light, making it impossible to see through.

• A quality of a medium that scatters light in all directions, creating a blurred image.

• A feature of a medium that reflects all light, preventing any visibility through it.

Luminous flux

• The amount of light energy emitted per unit time, measured in lumens (lm).

• The total energy of light emitted in all directions from a source, measured in watts.

• The intensity of light as perceived by the human eye, measured in candelas.

• The rate at which light energy is absorbed by a surface, measured in joules.

Opaque

• A property that allows light to pass through completely.

• A property that allows some light to pass through while blocking others.

• A property of a medium that allows it to absorb light and reflect some light rather than transmitting it, preventing objects from being seen through it.

• A property that makes objects appear transparent.

Illuminance

• The amount of light emitted by a source.

• The rate at which light strikes a surface, or falls on a unit area; measured in lumens per square meter (lm/m^2) or lux (1x).

• The total amount of light in a room.

• The brightness perceived by the human eye.