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Click Here For Best Selection Of High Quality Polarizing Microscope

Click Here For Best Selection Of High Quality Polarizing Microscope

According to some authors, the human eye is constructed for the purpose of discriminating the different wavelengths of light. The perception of colors of light can be expressed according to their vacuum wavelengths. For instance, the light having vacuum wavelength of about 660 nm is perceived red, while those whose vacuum wavelength is about 600 nm is perceived orange, and so on and so forth. But it is more preferred to perhaps talk about the different Frequencies of light rather than wavelengths because of the fact that Frequency does not change on passing through different kinds of materials. However, it must be noted that the convention is to identify the different colors with their wavelengths in a vacuum.

A monochromatic light is the kind of light that essentially has all one wavelength when it reaches the eye. And this kind of light is perceived as whatever wavelength is present. Polychromatic light on the other hand consists of more than one wavelength. If a polychromatic light strikes the color receptors of the eye, the combination of wavelengths is still perceived as a single color, even though the wavelength associated with that color might not actually be present in the light. The sensation of all colors can be produced by suitable combinations of two or more different wavelengths except for those corresponding to wavelengths of about 420nm, 500nm, and 660nm, which are colored violet, green, and red respectively.

The human eye perceives the light as white when the entire visible spectrum is present. The various combinations of two colors called complementary light colors will be also perceive by the eye as white. Despite the fact that there are many and almost infinite number of complementary light color sets, none include wavelengths in the green field. Other color sensations can be formed by combining various wavelengths and example of these are purple and brown, which have no counterpart in the visible spectrum. The mixtures of red and violet light produce the sensation of purple color. While the sensation of brown, is produced by the mixtures of yellow, blue, and red light.

Perception of color is very important in some areas in optical mineralogy. And some forms of color blindness would affect one’s perception of color. If one were color blind, he would certainly pose a hardship because he may have the inability to perceive colors correctly. But then he would still be able to deal with minerals by focusing into some properties of minerals that do not require the accurate perception of colors. If there exist any indication that an individual is color blind, he is then advised to see the vision specialist.



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Wednesday, February 27th, 2008 at 3:52 am
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Optical Mineralogy
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