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Encyclopedia Britannica



CONVEX

This article appears in Volume V23, Page 4 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: COM-COR
CONVEX
MIRROR
 
Position of
Object
 . Position of Image.
Character
  of Image.
to Between co and A A
The above discussion of spherical mirrors assumes that the
mirror
  has such a small aperture that the reflected rays from any point unite in a point. This, however, no longer holds when the mirror has a wide aperture, and in general the reflected rays envelop a
caustic
  (q.v., see also ABERRATION). The only mirror which can sharply reproduce an
object
 -point as an image-point has for its
section
  an ellipse, which is so placed that the object and image are at its foci. This follows from a property of the curve, viz. the sum of the focal distances is
constant
 , and that the focal vectores are equally inclined to the normal at the point. More important than the elliptical mirror, however, is the parabolic, which has the property of converting rays parallel to,the
axis
  into a pencil through its
focus
 ; or, inversely, rays from a source placed at the
focus
  are converted into a parallel beam; hence the use of this mirror in
search
 -
lights
  and similar devices.


End of Article: CONVEX


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