Linear magnification is m - 1 for a plane mirror. What is the significance of m - 1 and the positive sign of m ???
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Explanation:
In magnification, there are generally two aspects to be seen. One is the amplitude of magnification which is 1 in given case. This means that the size of the image formed is the same as that of the object and the second important parameter is that whether the image is same or inverted and here the positive sign indicates that the image formed is not inverted
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