Why we use plane mirror as a looking glass?
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Plane mirrors are used as looking glass. ... When the pointer moves, the image in the plane mirror also moves. Now the eye is so placed that the pointer covers its own image, and thus the pointer and its image coincides. Thus the eye, the pointer and its image in the mirror are in the same line perpendicular to the scale
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Answer:
Plane mirror are used as a looking glass because the size of the object remains the same after reflection.
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