| 185. |
The filament is
placed in front of a concave parabolic mirror for a
searchlight. The light reflected forms a parallel beam because
the filament is placed
|
|
A. |
half-way between
the center of curvature and focal point. |
|
Parallel
light waves reflect through the the focal point and light that passes
through the focal length reflects parallel to the principal axis.
The Correct Answer is C. |
|
B. |
at the center of
curvature. |
|
|
C. |
at the focal point. |
|
|
D. |
between the focal
point and the mirror |
|
