Abstract
By observing shadows and the positions of the light sources and objects that cause the shadows, it is easy to deduce that light normally travels in straight lines.
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Glossary of Terms
- anamorphosis (anamorphic art)
-
Artistic use of distorted images that require special mirrors to make them intelligible.
- camera obscura
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A darkened enclosure having an aperture through which light from external objects enters to form an image of the objects on the opposite surface.
- concave surface
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A surface curved like the inside of a ball.
- convex surface
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A surface curved like the outside of a ball.
- diffuse reflection
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Reflection of rays from a rough surface. The reflected rays scatter and no image is formed.
- focus (focal point)
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A point at which incident rays parallel to the axis of a mirror will cross after reflection.
- image
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Replica of an object formed by a mirror (or lens).
- kaleidoscope
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A device that uses two or more mirrors to form symmetrical, colorful images.
- law of reflection
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The angle of incidence equals the angle of reflection. Ordinarily, both angles are measured from the normal (perpendicular) to the surface.
- magnification
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The ratio of the size of image to size of object.
- plane of incidence
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Plane that includes the incident ray and the normal (perpendicular) to the surface.
- reflection
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Change of direction (with reversal of the normal component) at a surface.
- specular reflection
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Reflection from a polished surface in which parallel rays remain parallel.
- virtual image
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An image created by the apparent intersection of reflected light rays when they are extended behind the reflecting surface. A virtual image cannot be projected onto a screen.
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Rossing, T.D., Chiaverina, C.J. (2019). Ray Optics: Reflection, Mirrors, and Kaleidoscopes. In: Light Science. Springer, Cham. https://doi.org/10.1007/978-3-030-27103-9_3
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DOI: https://doi.org/10.1007/978-3-030-27103-9_3
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