Which mirror should be used to obtain a parallel beam of light from a small lamp?
Plane mirror
Convex mirror
None of the above
Concave mirror
A
None of the above
B
Convex mirror
C
Plane mirror
D
Concave mirror
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Solution
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When the lamp is placed at the focus of the mirror then all the light after reflection becomes parallel to the axis of the mirror as shown in the figure.
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