If the image formed by a mirror for all positions of the object placed in front of it is always erect and diminished, what type of mirror is it? Draw a ray diagram to justify your answer. Where and why do we generally use this type of mirror?
A convex mirror always produces an erect and diminished image of the object placed in front of it irrespective of the position of the object.
Consider a case in which an object is placed anywhere between pole (P) and infinity in front of a convex mirror. The ray diagram is as shown:-
A virtual, erect and diminished image will be formed behind the mirror between the pole (P) and focus (F) of the mirror.
As a convex mirror gives a wide field of view, it is used as a rear view mirror in vehicles.
It enables the driver to view a much larger area of the traffic behind. It is also used as shop security mirrors.
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