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Lens
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===About Lenses===
: A [[lens]] can be [[Convex Lens|convex]] or [[Concave Lens|concave]].
: There is a [[lens]] in the [[eye]] that is used to [[focus]] an [[image]] onto the [[retina]].
: Glass [[lens]]es can be moved relative to a screen until an [[image]] is [[focus]]ed but the [[lens]] in the [[eye]] can change shape to [[focus]] light.
==Key Stage 4==
===Meaning===
A [[lens]] is a shaped piece of [[glass]], or other [[transparent]] [[material]], that can be used to [[focus]] an [[image]] of an [[object]].
===About Lenses===
: A [[lens]] can be [[Convex Lens|convex]], also called a [[Converging Lens|converging lens]] or [[Concave Lens|concave]], also called a [[Diverging Lens|diverging lens]].
: [[Lens]]es can be used to create a [[Real Image|real image]] by [[focus]]sing light onto a [[screen]], or they can create a [[Virtual Image|virtual image]] by looking through the [[lens]].
: The shape of the [[lens]] determines its [[Focal Length|focal length]]. For a [[Convex Lens|convex lens]] ([[Converging Lens|converging lens]]) the [[Focal Length|focal length]] can be found by [[focus]]sing the [[image]] of a "distant object" onto a [[screen]]. The distance between the [[screen]] and [[lens]] is the [[Focal Length|focal length]].
: There is a [[lens]] in the [[eye]] that is used to [[focus]] an [[image]] onto the [[retina]].
: Glass [[lens]]es can be moved relative to a screen until an [[image]] is [[focus]]ed but the [[lens]] in the [[eye]] can change shape to [[focus]] light.