A person 6 feet in height can see his full size erect image in a mirror. The image is 2 feet in height. This mirror has to be:

Plane or Convex

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Plane or Concave

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Necessarily Convex

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Necessarily Concave

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Solution

The correct option is C Necessarily Convex
The image height is 2 feet, while the object height is 6 feet. So, the image is diminished.
It is also given that the image is erect.

The mirror has to be convex because an erect and diminished image can be formed by convex mirror only.

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