Is it true that in torches, searchlights and headlights of vehicles, the bulb is placed at the focus of the reflecting mirror?

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True

False

answer is A.

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Detailed Solution

The above statement is true.
Concave mirrors are commonly used in torches, searchlights and vehicle headlights to get powerful parallel beams of light. "We know that when an object is placed at the focus of the concave mirror, then the image formation takes place at infinity, and the image formed is infinitely enlarged." It means that the light goes to the maximum distance when the bulb is placed at the focus. That's why in torches, searchlights and headlights of vehicles, the bulb is placed at the focus of the reflector to get a parallel beam of light through which we can see objects at long distances.

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