the image of an object is real inverted and magnification is -1. If the image of the object is 40 cm from the mirror where is the object placed? where would the image firm when object is moved 20 cm to the mirror. State reason and draw ray diagram
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Whenever you calculate the questions based on mirror or lens, the object is always at left of the mirror or the lens. And because it is at the left side, the distance between the object and the mirror or lens is written as negative.
Please read Cartesian sign convention.
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