Question

If a point light source is placed at the focus of a concave mirror then how should a plane mirror be placed in front of the concave mirror so that after reflection from the concave mirror and plane mirror and again from the concave mirror the final image will be formed at the object itself.
options:

(a) making 45degree with principal axis
(b) parallel to principal axis
(c) perpendicular to principal axis
(d) (None)
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Answer 1

Answer:

b. parallel to principal axis (may be)