In torches, search lights and headlights of vehicles the bulb is placed
(a) between the pole and the focus of the reflector
(b) very near to the focus of the reflector
(c) between the focus and centre of curvature of the reflector
at the centre of curvature of the reflector

Question

In torches, search lights and headlights of vehicles the bulb is placed
(a)	between the pole and the focus of the reflector
(b)	very near to the focus of the reflector
(c)	between the focus and centre of curvature of the reflector
at the centre of curvature of the reflector

MyClass24 · Accepted Answer

Soln:

Answer is (b) very near to the focus of the reflector
Explanation:
Headlight reflectors and search lights are in the shape of concave mirror. When source of light is placed at the focus, reflected light appears like a beam.

In torches, search lights and headlights of vehicles the bulb is placed (a) between the pole and the focus of the reflector (b) very near to the focus of the reflector (c) between the focus and centre of curvature of the reflector at the centre of curvature of the reflector