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===About Concave Lenses===
: A '''concave lens''' causes [[parallel]] [[Light Ray|rays]] of [[light]] to [[diverge]], so it can also be called a [[Diverging Lens|diverging lens]].
: A '''concave''' [[lens]] cannot be used to [[focus]] [[light]]. However, they are used in [[glasses]] to correct the [[focus]]sing of a [[lens]] in the [[eye]].
: '''Concave [[lens]]es''' produce a [[Virtual Image|virtual image]].