Kryptonite is a fictional mineral that appears in stories about Superman. It was created as a plot device to weaken the character. In reality, kryptonite does not exist.
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A convex mirror is real because it reflects light and forms a real image.
Yes, a convex lens can produce a real image when the object is placed beyond the focal point of the lens. The real image is formed on the opposite side of the lens from the object.
James Prescott Joule.
Fat Albert. his real name is Albert Michael read.
A concave mirror could be used, as it can produce a real image that is the same size as the object when the object is placed at the focal point of the mirror.