Q133 / 180 · COMEDK 2017 · Physics

Which mirror is to be used to obtain a parallel beam of light from a small lamp?

A
Plane mirror
B
Convex mirror
Correct answer
C
Concave mirror
D
Any one of the above

Solution

A concave mirror is of converging type as the light parallel to principal axis converges at its focus. So, when a lamp is placed at its focus, the ray of light falling on it becomes parallel beam as shown below.

Hence, the correct answer is option: 'C'.

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