Geometrical OpticsHard
Question
A ray of light incident on a concave mirror. It is parallel to the principal axis and its height from principal axis is equal to the focal length of the mirror. The ratio of the distance of point B to the distance of the focus from the center of curvature is (AB is the reflected ray)
Options
A.
B.
C.
D.
Solution
In ᐃACD : sin θ =
⇒ θ = 30oPB = R -
sec θ = R -
PC = R ⇒ CB = PC - PB = R - R +
=
= 
∴ 
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