In torches,searchlights,and headlights of veh | vedclass

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(D) In torches,searchlights,and vehicle headlights,a concave mirror is used as a reflector.According to the properties of a concave mirror,when a ligh

Vedclass · Accepted Answer

very near to the focus of the reflector

Vedclass · Answer

(D) In torches,searchlights,and vehicle headlights,a concave mirror is used as a reflector.According to the properties of a concave mirror,when a light source (bulb) is placed at the focus $(F)$,the light rays emanating from it strike the mirror and are reflected as a parallel beam of light.This parallel beam of light travels over a long distance,which is essential for these devices to illuminate distant objects.Therefore,the bulb is placed very near to the focus of the reflector.

In torches,searchlights,and headlights of vehicles,the bulb is placed:

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