Unit: Optics
Year: 1992 Question#: 90
Question: In the diagram below, an object is located in front of a convex (diverging) mirror. F is the virtual focal point of the mirror and C is its center of curvature. Ray R is parallel to the principal axis.
(1 ) 1
(2 ) 2
(3 ) 3
(4 ) 4
What is this question really asking?
Explanation by: Kay T
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KayTye 92-90
Answer 1
Ray 1
INCORRECT
because the path taken here would be taken by a ray reflecting off of a concave mirror, not a convex mirror. return to top
KayTye92-90
Answer 2
Ray 2
INCORRECT
because this ray path is reflecting in line with the center instead of the focus. return to top
KayTye 92-90
Answer 3
Ray 3
CORRECT
because this ray path is reflecting in line with the focus which is what should happen when a ray is parallel to the pricipal axis and is reflecting of a diverging mirror. return to top
KayTye 92-90
Answer 4
Ray 4
INCORRECT
because this ray path does not correlate to any of the principal rays and specifically, does not follow the line of the focus. return to top
KayTye 92-90
What's this question really asking?
Do you know how the focus of a convex mirror relates to the path of a ray parallel to the prinicpal axis? return to top
