Which mirror is used as a rear-view mirror in vehicles, and why?
AConvex — wider field of view, erect diminished image
BConcave — magnified image of vehicles behind
CPlane — undistorted same-size image
DConcave — to converge headlight beams
Answer & Solution
Correct answer: A. Convex — wider field of view, erect diminished image
Convex mirrors always form erect, diminished, virtual images and have a wider field of view, letting the driver see more traffic behind. Concave would invert and magnify, useless here.
Related questions
For a concave mirror, as an object moves from infinity towards the focus, the real imageThe power of a lens is −2.5 D. The lens isA small bulb is placed at the focus of a concave mirror of focal length 12 cm. The reflectAn object 4 cm tall is placed 15 cm from a convex lens of focal length 10 cm. The image heA ray of light travelling in air enters water (n = 4/3). It bendsThe laws of reflection hold good forA convex lens forms a real image three times the size of the object on a screen. If the foAn object is placed at the centre of curvature of a concave mirror. The image formed is