Apologia Physical Science Module 15

Electromagnetic wave

A transverse wave composed of an oscillating electric field and a magnetic field that oscillates perpendicular to the electric field

Visible spectrum

The light we see with our eyes

Law of Reflection

The angle of reflection equals the angle of incidence

Angle of incidence

The angle of the incoming light

Angle of reflection

The angle of the reflected light


When light enters an obstacle and bends in response to its change in speed

Additive primary colors

Red - Blue - Green
Colors used by a color TV or computer monitor to produce all colors

Subtractive primary colors

Cyan - Magenta - Yellow
Colors used with inks, dyes, or paints to produce other colors


Colors in the visible spectrum, from low frequency to high frequency (Red, Orange, Yellow, Green, Blue, Indigo, and Violet)

Convex lens

Lenses that converge light rays

Concave lens

Lenses that diverge light rays


The part of the eye that is sensitive to colors


The part of the eye that is sensitive to white light