Question

Why does a driver use a convex mirror instead of a plane mirror as a rear view mirror? Illustrate your answer with the help of a ray diagram.

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Answer

A convex mirror diverges the incident light beam and always forms a virtual, small and erect image behind the mirror between it’s pole and focus. This fact enables the driver to use it as a rear view mirror in vehicles to see all the traffic approaching from behind.

Although a plane mirror can also be used as a rear view mirror, but a convex mirror provides a much wider field view as compared to a plane mirror of the same size.

The below diagram shows how a convex mirror provides a better field view than a plane mirror.

convex-mirror-as-rear-view-mirror-concise-physics-solutions-icse-class-9-1200x1086

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