Ray Optics: Reflection, Mirrors, and Kaleidoscopes
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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.
Glossary of Terms
Artistic use of distorted images that require special mirrors to make them intelligible.
A darkened enclosure having an aperture through which light from external objects enters to form an image of the objects on the opposite surface.
A surface curved like the inside of a ball.
A surface curved like the outside of a ball.
Reflection of rays from a rough surface. The reflected rays scatter and no image is formed.
A point at which incident rays parallel to the axis of a mirror will cross after reflection.
Replica of an object formed by a mirror (or lens).
A device that uses two or more mirrors to form symmetrical, colorful images.
The angle of incidence equals the angle of reflection. Ordinarily, both angles are measured from the normal (perpendicular) to the surface.
The ratio of the size of image to size of object.
Plane that includes the incident ray and the normal (perpendicular) to the surface.
Change of direction (with reversal of the normal component) at a surface.
Reflection from a polished surface in which parallel rays remain parallel.
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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