Parallel beam of light rays after reflection from a concave mirror pass,… [ ]
- through focal point
A) Through centre of curvature
B) Parallel to principal axis
C) A and B
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parallel beam of light ray parallel to the X-axis is incident on a parabolic reflecting surface x=2by
2
as shown in the figure. After reflecting it passes through focal point F. The focal length of the reflecting surface is:
740613
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through focal point ........
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