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Question

Which mirror should be used to obtain a parallel beam of light from a small lamp?
  1. Plane mirror
  2. Convex mirror
  3. None of the above
  4. Concave mirror

A
None of the above
B
Convex mirror
C
Plane mirror
D
Concave mirror
Solution
Verified by Toppr

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.
82988_93762_ans_63e4ead770774847ad54691e4161cd0b.png

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