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Click Here For Best Selection Of High Quality Polarizing Microscope

Click Here For Best Selection Of High Quality Polarizing Microscope

Velocity

 

            The velocity of light is very dependent on the wavelength of light and on the nature of the material that it travels through. In a vacuum, the maximum possible velocity is 3.0 x 10exp10 cm/sec. The light usually slowed down when it enters any other medium. If why light slowed down is simply explained here through its involvement in the interaction between the electric vector of the light and the electronic environment around each atom. A positively charges nucleus that is surrounded by a number of negatively charges electrons are consist in each atom. Generally, a nucleus is to heavy to respond to forces imposed by the electric vector of light. But then the electrons are found having low mass and can respond. The electron cloud around the atom is excited and is forced to vibrate or oscillate at the same frequency as the light when the light would strike an atom. The light would be re-emitted by the excited electron cloud. The re-emitted light is usually found out of phase with the incident light because the nature of the interaction between the electrons and the light. Then the next atom along the path followed by the light will be striked by the re-emitted light, and the process will be repeated. The interference between the re-emitted light and the original light cancels the original light and produces a series of new light waves having the same frequency but with shorter wavelength and lower velocity. This can be actually shown through a series of derivations.

 

Reflection

 

            Some of the light may enter the new material and the remainder is usually reflected at the boundary when this light reaches a boundary between two materials. It can be also found that the angle of reflection and the angle of incidence are identical.



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Wednesday, February 27th, 2008 at 3:48 am
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Optical Mineralogy
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