Which property is common to all halogens? they are all highly reactive nonmetals. they are all unreactive nonmetals. they are all metalloids. they are all highly reactive metals.

they are all highly reactive nonmetals

concave lenses are used here. they spread the light out before it reaches the convex lens in the eye, therefore letting the image focus directly on the retina. hyperopia is known to you probably as farsightedness.