Which of the following statements are true concerning signconventions for image formation?

Check all that apply.

	A virtual image has a positive image distance; a real image hasa negative image distance.
	For an upright image, the magnification is positive; for aninverted image, the magnification is negative.
	When the center of curvature of a spherical mirror is on thesame side as the reflected light, the radius of curvature ispositive; otherwise, it is negative.
	A converging lens has a negative focal length; a diverging lenshas a positive focal length.
	When the object is on the same side of the reflecting orrefracting surface as the incoming light, the object distance ispositive; otherwise, it is negative.

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