Parabolic Reflector
From Math Images
- Solar Dishes such as the one shown use a paraboloid shape to focus the incoming light into a single collector.
Basic Description
The geometry of a parabola makes this shape useful for such solar dishes. If the dish is facing the sun, beams of light coming from the sun are essentially parallel to each other when they hit the dish. Upon hitting the surface of the dish, the beams are reflected directly towards the focus of the parabola, which is where a device to absorb the sun's energy would be located.
We can see why beams of light hitting the parabola-shaped dish will reflect towards the same point. A beam of light reflects 'over' the line perpendicular to the parabola at the point of contact. In other words, the angle the light beam makes with the perpendicular when it hits the parabola is equal to the angle it makes with same perpendicular after being reflected.
A More Mathematical Explanation
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Parabolic Reflector Dish |
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