Single correct option
The mirror commonly used as a rear-view mirror in vehicles is
- A. concave, because it gives a magnified image
- B. convex, because it gives an erect, diminished image with a wide field of view
- C. plane, because it gives a laterally inverted image of the same size
- D. concave, because it converges light to a focus
Show answer and solution
Answer: (B) convex, because it gives an erect, diminished image with a wide field of view
A convex mirror always forms a virtual, erect and diminished image and covers a wide area behind the vehicle, so the driver sees more traffic. A concave mirror gives a narrow field and may invert distant objects; a plane mirror has a small field of view. Convex mirrors are therefore chosen for safety.
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