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"c) Focal length of a convex mirror or convex lens is always taken as positive " this option is incorrect.
Explanation:
Because the focal length, is positive for a concave mirror, and negative for a convex mirror. When the image distance is positive, the image is on the same side of the mirror as the object, and it is real and inverted. A negative m means that the image is inverted. Positive means an upright .
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Answer:
nice dp bro...............c is incorrect
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