Science Notes by Ahmet Arduc - Mirrors and Reflection

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Mirrors and Reflection
Science Notes by Ahmet Arduc - www.ahmath.com

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Science Notes by Ahmet Arduc - Mirrors and Reflection

  1. 1. Mirrors and Reflection by Ahmet Arduc – www.ahmath.com
  2. 2. And, unlike cars, computers, airplanes, or light bulbs, they use up none of the earth’s limited resources. They simply take advantage of the natural properties of light. We see objects in the world around us because light is reflected off those objects and enters our eyes, which are specially adapted to send messages to the brain so it can interpret it as information. We see because our eyes are sensitive to light. Our eyes collect natural and artificial light that is then interpreted by the brain and turned into visual pictures.
  3. 3. Light travels in straight lines called rays.
  4. 4. Since the beginning of history, humankind has been interested in studying both how light behaves normally and how it can be manipulated. The easiest way to explain how light behaves is to think of light as travelling in imaginary straight lines called rays. When you turn on an ordinary light bulb, you can imagine that the light that floods the room is made up of rays that radiate out from the bulb in every direction. We cannot count all the rays coming from the light bulb, or from any other light source, but we can pick just a few rays and use them to represent the overall direction and movement of light.
  5. 5. The light that is reflected off objects is basically the same as the light that comes from any other light source -such as an overhead light, or even the sun- in that it travels in straight lines called rays.
  6. 6. One such case is when light hits a smooth, shiny, or metallic surface. When this happens, very little light is absorbed, and the light is reflected in a very regular and predictable way. When light hits most surfaces, those rays that are not absorbed by the surface are bounced off randomly in all directions. But there are special cases in which light rays are reflected in ways that can be predicted.
  7. 7. F117-Nighthawk. It has flat surfaces, called facets, and very sharp edges.
  8. 8. In general, it is acceptable to imagine that light rays travel in straight lines until they hit something. What happens next depends on what they hit. Most often, light hits the surfaces of common, everyday objects like, for example, a desk with a book on it. When the light hits the desk and book, most of the light is simply absorbed, but some is reflected. If someone in the room were to look at the desk, some of the reflected light would enter his or her eyes and enable the brain to form a picture.
  9. 9. The simplest way to explain this is to imagine that the light rays bounce off the surface at the same angle at which they strike the surface, much like a rubber ball bouncing on the ground.
  10. 10. Reflections in a mirror are formed when light rays bounce off an object and strike the mirror. When light rays strike the surface of a mirror, they again bounce off, or are reflected by, the mirror. A periscope lets you see over the top of things, such as fences or walls that you aren't tall enough to look over. A simple periscope is just a long tube with a mirror at each end. The mirrors are fitted into each end of the tube at an angle of exactly 45 degrees (45°) so that they face each other.
  11. 11. People have been using smooth, shiny, metallic surfaces for thousands of years to reflect light for various purposes. A flat (plane) mirror is any device designed to reflect light in a regular pattern so that the reflected image remains true. Usually, a mirror is made from a highly reflective silvery substance covered by glass or sturdy clear plastic to protect the surface.
  12. 12. Because the surface of a flat mirror is smooth and shiny, light rays are reflected off of the mirror at the same angle at which they strike the mirror. Thus they form an exact replica ‘inside’ the mirror of the object in front of the mirror. This principle is known as the law of reflection.
  13. 13. Lenses and mirrors are two of the most significant inventions in our history. From bathroom mirrors and reading glasses to the most advanced optical instruments used by scientists on earth and in space, lenses and mirrors affect our lives in very important ways.
  14. 14. For many people, light from an image is not perfectly focused on their retina. Depending on the severity of the deviance, this can lead to a person needing to wear glasses. A short-sighted person can see things close-up, but has trouble seeing things further away. A long-sighted person struggles to see near objects, but can see distant objects.
  15. 15. Most of the things we see every day are not sources of light, so it is not inherently obvious that we only see light. We see things that are not light sources - common, everyday objects - because light bounces off them and into our eyes. light emitted by a light source can reach the eye either directly or indirectly. When light bounces off the surface of an object, the object is said to be visible. The sun, the flame of a candle or the incandescent filament of a light bulb are visible to the eye because they emit their own light. These objects are called light sources.
  16. 16. The different colors and shades of light and dark that we see are due to the different ways in which light bounces off the objects in the world around us.
  17. 17. Visible light is just a kind of electromagnetic radiation that our eyes can detect. http://htwins.net/scale2/

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