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Easa part 66 module 2 Chapter 4/5.
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Module 2: Physics
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PART 66 Module 2 pdf
Light is a form of electromagnetic radiation. It is part of the wide spectrum of electromagnetic radiation that surrounds us at all times. Visible light is a relatively small part of the spectrum part 66 module 2 pdf.
SPEED OF LIGHT Light is a type of wave. As in the case of all wave motion, the wave moves with a definite speed.
The speed of light (c) is exactly 299 792 458 meters per second which is 186 282.4 miles per second. It should be noted that this is the speed of light in a vacuum. The passage of light through matter reduces this speed. Materials have a refractive index (n) which is the speed of light (c) in a vacuum divided by the speed of light through the material (v).
The refractive index of air is 1.000 29. The refractive index of water is 1.33 and approximately 1.6 for glass. This means that light travels slower through water than air and slower through glass than water part 66 module 2 pdf.