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عبدالله المالكي الإثنين أبريل 06, 2009 10:45 pmReflection
Reflection is the returning, or "bouncing" of a wave off of a surface which resists that kind of wave. When it reflects, it always does so at the exact same angle it came in at. If you shine a light directly at a 90 degree angle, it will come directly back at a 90 degree angle. If you shine it 45 degrees to the left, it will exit 45 degrees to the right. The angle at which the light comes in is called the angle of incidence, while the angle at which it exits is called the angle of reflection. This observation is called the scientific law of reflection, which states that the angle of incidence is equal to the angle of reflection. A reflection coming off a smooth surface is sharp, because the waves are allowed to return "intact", without being disturbed. But, if the reflective surface is not a smooth one, what is called diffuse reflection occurs. Because the surface is not smooth, different parts of the light hit the surface in different places at different depths and different times. This results in a mostly blurred image, which is why rough, grainy surfaces do not reflect images well.
Total internal reflection is a special case of reflection created when when a light passes from a more optically dense medium to a less dense one at an angle such that there is no refracted ray. This is why rainbows appear, a prisim or the same effect in nature can extend the range of total internal reflection beyond it's usual confinement, allowing us to view the spectrum. This is also how optical fibers work, the fibers are specifically constructed to produce this effect, preserving the intensity of the light as it passes throught the fiber to its destination.
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Reflection is the returning, or "bouncing" of a wave off of a surface which resists that kind of wave. When it reflects, it always does so at the exact same angle it came in at. If you shine a light directly at a 90 degree angle, it will come directly back at a 90 degree angle. If you shine it 45 degrees to the left, it will exit 45 degrees to the right. The angle at which the light comes in is called the angle of incidence, while the angle at which it exits is called the angle of reflection. This observation is called the scientific law of reflection, which states that the angle of incidence is equal to the angle of reflection. A reflection coming off a smooth surface is sharp, because the waves are allowed to return "intact", without being disturbed. But, if the reflective surface is not a smooth one, what is called diffuse reflection occurs. Because the surface is not smooth, different parts of the light hit the surface in different places at different depths and different times. This results in a mostly blurred image, which is why rough, grainy surfaces do not reflect images well.
Total internal reflection is a special case of reflection created when when a light passes from a more optically dense medium to a less dense one at an angle such that there is no refracted ray. This is why rainbows appear, a prisim or the same effect in nature can extend the range of total internal reflection beyond it's usual confinement, allowing us to view the spectrum. This is also how optical fibers work, the fibers are specifically constructed to produce this effect, preserving the intensity of the light as it passes throught the fiber to its destination.
اتمنى لكم النجاح والتوفيق