Physics Review Question|
Year: 1993 Question#: 87
Question: The diagram below shows light ray R parallel to the principal axis of a spherical concave (converging) mirror. Point F is the focal point of the mirror and C is the center of curvature.
After reflecting, the light ray will pass through point
(1 ) A
(2 ) F
(3 ) C
(4 ) D
What is this question really asking?
Explanation by: Danica A
[ Return to question menu ]
The incident ray will not reflect straight back. It would have had to strike the mirror along a normal (perpendicular) line, which it does not. return to top
Light rays that run parallel to the principal axis are reflected through the focal point. Since ray R is running parallel to the principal axis, it will pass through point F, the focal point. return to top
Point C is the center of curvature of the mirror. When ray R is reflected, it will pass through the focal point (see explanation for answer 2), not the center of curvature. return to top
This point is on the mirror. Rays reflect off mirrors.
return to top
What's this question really asking?
If a ray runs parallel to the principal axis, though which piont will the ray reflect?
return to top
This web site is designed and maintained by Science Joy Wagon and may
not be reproduced or redistributed without written permission from Science Joy Wagon.