Where should the light source (bulb) be place | vedclass

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Question

(C) In a searchlight or torch,a concave mirror is used as a reflector.According to the properties of a concave mirror,when a light source is placed at

Vedclass · Accepted Answer

At the principal focus

Vedclass · Answer

(C) In a searchlight or torch,a concave mirror is used as a reflector.According to the properties of a concave mirror,when a light source is placed at the principal focus $(F)$,the light rays originating from it strike the mirror and are reflected as a parallel beam of light.These parallel rays do not diverge significantly and can travel over a long distance.Therefore,the bulb is placed at the principal focus.

Where should the light source (bulb) be placed in the reflector of a searchlight or torch so that the light rays travel over a long distance?

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