is the object distance positive or negative when we take a virtual object??
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Image distances are always negative for virtual images and positive for real images. Object distances are always positive.
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The object distance is always positive. It is the distance between the object and the lense, or mirror. The (real) image distance is positive on the other side in case of a lense. Only when the image is a virtual one, on the same side of the lense as the object, is the image distance negative
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