A material that transmits light

straight line used to represent a light wave

A curved piece of glass or other transparent material that is used to refract light.

A lens that is thinner in the center than at the edges.

An opaque substance used to color other materials.

The amount a ray of light bends when it passes from one medium to another.

An image of a distant object caused by refraction of light as it travels through air of varying temperatures.

Cells on the retina that detect color.

An optical instrument that forms enlarged images of distant objects and makes them appear closer.