a point object is placed on the principal axis of a spherical mirror the object distance u is
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A point object is placed on the principal axis at 60 cm in front of a concave mirror of length 40 cm on the principal axis. If the object is moved with a velocity of 10 cm/s along the principal axis, then the velocity (only magnitude ) of image is
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Negative if the object is to the left of the pole
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