In the concave reflector of a torch, the bulb is placed at?

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Between the pole and focus of reflector

At the focus of reflector

Between focus and centre of curvature of reflector

At the centre of curvature of reflector

answer is B.

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Detailed Solution

In the concave reflector of a torch, the bulb is placed at the reflector's focus.
In torches, searchlights and headlights of vehicles, the bulb is placed very near to the reflector's focus to get a parallel beam of light through which we can see to a longer distance.
Concave mirrors are used in torch reflectors because when the bulb of the headlight is situated at the focus of the concave mirror, after the reflection, it will allow the light to spread out to infinity. The lights emitted by the torch bulbs cover a wider field of view. This is precisely why the light rays from a torch bulb can reach a great distance.
A concave mirror is a mirror which consists of a reflective surface that is curved inward, and the curve is away from the light source. Unlike convex mirrors, depending on the distance between the object and the mirror, the image formed by a concave mirror shows different image types.

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