31.If point object is placed at the focus of a concave mirror and m is lateral magnification obtained in the size of image, then 1) m=0 2)m>1 3)m<<1 4)m tends to minus infinity

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If a magnification of, -1 (minus one) is to be obtained by using a converging mirror, then the object has to be placed:
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Q. An object is placed in front of the concave mirror at its focus. When an object moves from focus towards infinity the real image…….

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