|Spanish - Chinese||The Optics Book - G.O. and Thin Lenses||Written by:Karen|
The Optics Book
Plane mirrors are the mirrors which we use to view ourselves in. When we look into a plane mirror, we see our reflection, which isnt distorted in size. But the image formed is left right reversed. That is why if you have a birthmark on your right cheek, it will appear to be on your left cheek in a mirror. Because the image is erect it must be virtual.
Curved mirrors work in the same way that lenses work. The difference is that a concave mirror, works the way a convex lens does, and a convex mirror works the way a concave lens does. This means that a concave mirror is a converging mirror, so the rays will focus on the same side of the mirror. On the other hand, a convex mirror will diverge and have a virtual focus located at a point F on the other side of the mirror. The center of curvature of a mirror is located at 2F.
One of the problems that a spherical mirror has is that Light rays wont focus directly onto F. Therefore the image is a little fuzzy. To correct this, mirrors are shaped parabolically, which forces the Light rays to focus onto F.
|The Optics. Made by Karen, Timothy and, César for ThinkQuest . 1999 - 2000 All rights reserved|