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Click Here For Best Selection Of High Quality Polarizing Microscope

Click Here For Best Selection Of High Quality Polarizing Microscope

At least some light can enter the higher-index material regardless of the angle of incidence when light travels from a low index-mineral to a higher-index one. But then this statement may not always hold true for those light going from a high-index material to a low-index material where the angle of refraction is larger than the angle of incidence. The angle of incidence that yields an angle of refraction of about 90 degree is called critical angle. It must be important to note that the light cannot be refracted into the low-index material if its angle of incidence is greater than the critical angle. It is also important to consider that it is not possible for any angle of incidence larger than the critical angle to have an angle of refraction larger than 90 degree. This is because an angle greater than 90 degree would prevent the light from passing or entering the low-index mineral. Instead of being refracted, the ray of light would exhibit a total internal reflection when it reaches the boundary at angles of incidence greater than the critical angle. This is because all of the light is reflected at the boundary. If the indices of the two materials are known, the critical angle in the first material can be calculated using the Snell’s Law.



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Wednesday, February 27th, 2008 at 3:46 am
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Optical Mineralogy
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