Light has the properties of both particle and waves. If we look for photons we will find them, but if we look for wave -like properties we can see them too. However, we cannot see both particle and wave properties at the same time.

It is often useful to confine light in an optical-cavity. This allows us both to make more intense light, as well as select light of a particular colour (or energy).

¨ Light travels at a speed of 2.99792458x10^{8} ms^{-1}

¨ When passing though matter, light is slowed down by

the waves spread out on the other side of the slit. When the two waves overlap, they interfere with each other.

the unique nature of light: light has the properties of both a wave and a

In modern physics, light or electromagnetic radiation may be viewed in one of two complementary ways: as a wave in an abstract electromagnetic field, or as a stream of massless particles called photons. Although either is an acceptable description of light, for our purposes in introductory astronomy the wave description will be more useful.

behavior that Young observed. When the light waves pass through the slit,

designed specifically to settle the debate over the nature of light once and

c = 3 x 1010 cm/second

Some common words found in the essay are:
, Light Wave, Max Planck's, Despite Young's, light wave, light particle, speed light, nature light, light behaves particle, explained light wave, thinking light particle, light properties, slit waves, explained light, particle wave, beam light, called photons, particular colour energy,
Approximate Word count = 827
Approximate Pages = 3 (250 words per page double spaced)