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7 7 Light

This fiber optics bundle carries pulses of light from an infrared laser to
transmit much more information than could be carried by electrons moving
through wires. This is part of a dramatic change that will find hybrid “opto-
electronics” replacing the more familiar “electronics” of electrons and wires.

CORE CONCEPT

Light is electromagnetic radiation—energy—that interacts with matter.

OUTLINE

Light Interacts with Matter
7.1 Sources of Light
Light that interacts with matter Reflection
7.2 Properties of Light
can be reflected, absorbed, or Light Interacts with Matter The law of reflection states that
transmitted. Reflection the angle of an incoming ray
Refraction of light and the angle of the
Dispersion and Color reflected light are always equal.
A Closer Look: Optics
Refraction 7.3 Evidence for Waves
Light moving from one Interference Evidence for Waves
transparent material to another A Closer Look: The Rainbow Interference and polarization
undergoes a change of direction Polarization provide evidence that light is
called refraction. A Closer Look: Lasers
A Closer Look: Why Is the Sky Blue? a wave.
7.4 Evidence for Particles
Photoelectric Effect
Evidence for Particles
Quantization of Energy
The photoelectric effect and the 7.5 The Present Theory The Present Theory
quantization of energy provide A Closer Look: The Compact Disc (CD) Light is considered to have a
evidence that light is a particle. 7.6 Relativity dual nature, sometimes acting
Special Relativity as a wave and sometimes acting
People Behind the Science: as a particle.
James Clerk Maxwell
General Theory
Relativity Theory Applied

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