If an incident ray passes through the focus, the reflected ray will
(a) pass through the pole
(b) be parallel to the principal axis
(c) retrace its path
(d) pass through the centre of curvature
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Answer:
(b) be parallel to the principal axis.
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Rule 3: When a ray of light passes through the focus, it becomes parallel to the principal axis after reflection. Rule 4: A ray of light which is incident at the pole is reflected back making the same angle with the principal axis.
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