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Two big mirrors A and B are fitted side by side on a wall. A man is standing at such a distance from the wall that he can see the erect image of his face in both the mirrors. When the man starts walking towards the mirrors, he finds that the size of his face in mirror A goes on increasing but that in mirror B remains the same:

Two big mirrors A and B are fitted side by side on a wall. A man is standing at such a distance from the wall that he can see the erect image of his face in both the mirrors. When the man starts walking towards the mirrors, he finds that the size of his face in mirror A goes on increasing but that in mirror B remains the same: Correct Answer Mirror A is concave and mirror B is plane

The correct answer is Mirror A is concave and Mirror B is plane.

Key Points

  • 1.Plane mirrors: These mirrors give a virtual and erect image of the size as that of the object when kept anywhere in its vicinity. The image formed will suffer from lateral inversion, otherwise, the image and the object look the same.
  • 2.Concave mirrors: These mirrors give real and inverted images for all the points from the focal point of the mirror to infinity. The mirror gives a virtual and erect image when the object is between the focal point and the mirror. During this time, the image is magnified also.
  • 3.Convex mirrors: These mirrors form images that are always virtual and erect. The image formed is always smaller than the object. The image size decreases as the object approaches the mirror. From the above discussions, we can understand the types of mirrors used as A and B. A has an erect image and the size of the image increases as the object approaches the mirror. Therefore, the mirror is a concave mirror.
  • The below diagram shows the virtual, erect, and enlarged image formed by mirror A. 

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  • B has an erect image and the image size is constant as the object approaches the mirror. Therefore, the mirror is a plane mirror.

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