invisible light

Introduction.
The visible light can travel in straingth line and invisible light travel in waves.

Radio Waves.
Radio waves are the longest waves of the electromagnetic spectrum.

Radar.

Recall that some animals, such as bats and whales, send out sound waves with a high frequency.

Microwaves.

A microwaves oven uses electromagnetic waves, too.

Infrared light.

Infrared means "just beyond red". Infrared waves are the next to visible red waves in the spectrum.

Ultraviolet Light.

Ultraviolet (UV) light is made up of waves just shorter than vicible violet light on the spectrum.

X rays and Gamma rays.

The shortest wavelenghts of the spectrum--X rays and gamma rays-- have great penetrating power.