Explain with the help of a diagram : why do we use concave mirror in torches, reflectors etc.
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They reflect and focus incoming light rays at a point which is called the focus point. A concave mirror is used as a reflector in torches, searchlights, headlights of motor vehicles, etc. to get a powerful parallel beam of light. This helps us to see things up to a considerable distance in the darkness of night.
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A concave mirror is used as a torch reflector. ... When a light bulb is placed at the focus of a concave mirror reflector, the diverging light rays of the bulb are collected by the reflector. These rays are then reflected to produce a strong, parallel-sided beam of light.
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