What kind of mirrors are used in big shopping stores to watch activities of customers? Why these mirrors are preferred?
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Convex mirror is the answer
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Convex mirrors are used in large shopping malls to view the activities of customers while they are shopping.
EXPLANATION:
Convex mirrors are the mirrors that have large field of view and allow keeping track of activities of a large number of customers at any given time. Convex mirrors are diverging mirrors in which the 'reflective surface' bulges towards the 'light source'. The image that is smaller appears to be larger in these mirrors and so activities of customers can easily be seen.
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