CHAPTER 14 SECTION 3

Electromagnetic Radiation–a combination of electrical and magnetic

energy• Like sound, light travels in waves that have

certain wavelengths and frequencies. • Its speed is different in different materials.• Light can be reflected or absorbed by certain

objects, or it can pass through them.

Electromagnetic Radiation• Some types of electromagnetic radiation have

wavelengths that are shorter than those of visible light.

ex: ultraviolet, x-ray, & gamma ray radiation• Longer waves have lower frequencies and

lower energies. ex: infrared waves, microwaves,

& radio waves.

How Does Light Move?

• Light travels the fastest in a vacuum. • It travels more slowly through materials

such as air or water.• Moves in straight lines.• If it reflects off an object light still moves

in a straight line but in a different direction.

• Light bends, or refracts, whenever it enters a new material

• White light that enters a prism comes out separated into its colors.

• A rainbow appears in the sky when light reflects and refracts in water droplets.

• An object in the path of light waves casts a shadow.

• The object casting the shadow blocks the path of light.

• A shadow is larger when the object is closer to the light source.

CONCAVE vs. CONVEX

Convex Lens: A magnifying glass contains a convex lens that bends light raysto make objects look larger.

Concave Lens: A concave lens is thinner in the middle than the edges. It can bend light rays to make an objectlook smaller.

Electromagnetic Radiation–a combination of electrical and magnetic

energy• Like sound, light travels in waves that have

certain wavelengths and frequencies. • Its speed is different in different materials.• Light can be reflected or absorbed by certain

objects, or it can pass through them.

Electromagnetic Radiation• Some types of electromagnetic radiation have

wavelengths that are shorter than those of visible light.

ex: ultraviolet, x-ray, & gamma ray radiation• Longer waves have lower frequencies and

lower energies. ex: infrared waves, microwaves,

& radio waves.

How Does Light Move?

• Light travels the fastest in a vacuum. • It travels more slowly through materials

such as air or water.• Moves in straight lines.• If it reflects off an object light still moves

in a straight line but in a different direction.

• Light bends, or refracts, whenever it enters a new material

• White light that enters a prism comes out separated into its colors.

• A rainbow appears in the sky when light reflects and refracts in water droplets.

• An object in the path of light waves casts a shadow.

• The object casting the shadow blocks the path of light.

• A shadow is larger when the object is closer to the light source.

CONCAVE vs. CONVEX

Convex Lens: A magnifying glass contains a convex lens that bends light raysto make objects look larger.

Concave Lens: A concave lens is thinner in the middle than the edges. It can bend light rays to make an objectlook smaller.