Discussion
Consider the following :
1. Torches
2. Vehicle headlights
3. Rear-view wing mirrors in vehicles
4. Shaving mirrors
In which of the above are concave mirrors used ?
Answer: C
Concave mirrors are used in 1, 2 and 4 only.
A torch and a vehicle headlight place the bulb at the focus of a concave reflector, so the reflected light leaves as a strong parallel beam. A shaving mirror is concave because a face held closer than the focus gives an upright, magnified image.
Rear-view wing mirrors are convex: they always give an upright, diminished image and a much wider field of view of the traffic behind. So options containing item 3 are wrong.
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