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Created page with "==Key Stage 4 Higher== ===Meaning=== A '''convex''' lens is a shaped piece of glass that is thickest at the centre and thinnest at the edges. {| class="wikitable" |-..."
==Key Stage 4 Higher==
===Meaning===
A '''convex''' [[lens]] is a shaped piece of [[glass]] that is thickest at the centre and thinnest at the edges.
{| class="wikitable"
|-
|[[File:ConcaveLens.png|center|100px]]
|[[File:ConcaveLensSymbol.png|center|100px]]
|-
| style="height:20px; width:200px; text-align:center;" |A picture of a '''concave lens'''.
| style="height:20px; width:200px; text-align:center;" |The symbol used in [[diagram]]s to represent a '''concave lens'''
|}
===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]].
===Focal Length of a Concave Lens===
{| class="wikitable"
|-
|[[File:ConcaveLensFocalPoint.png|center|500px]]
|-
| style="height:20px; width:200px; text-align:center;" |A '''concave lens''' causes [[parallel]] [[Light Ray|rays]] to [[diverge]]. The [[Focal Point|focal point]] for the '''concave lens''' is on the same side of the [[lens]] as the [[object]].
|}
: The [[Focal Length|focal length]] of a '''concave lens''' is the distance between the [[Focal Point|focal point]] and the centre of the [[lens]]. However, this cannot be [[measured]] through experiment.
===Ray Diagrams===
{| class="wikitable"
|-
|[[File:ConcaveRayDiagram.png|center|500px]]
|-
| style="height:20px; width:200px; text-align:center;" |A [[Ray Diagram|ray diagram]] for a '''concave [[lens]]'''.
In this [[diagram]]:
"Ray 1" is traced backwards after being [[refract]]ed by the [[lens]].
"Ray 2" is shown passing through the centre of the [[lens]]. This ray is also traced backwards.
The [[diagram]] shows that a [[diminish]]ed [[Virtual Image|virtual image]] is produced at the point that the 'traced' lines from "ray 1" and "ray 2" cross one another.
|}
===Meaning===
A '''convex''' [[lens]] is a shaped piece of [[glass]] that is thickest at the centre and thinnest at the edges.
{| class="wikitable"
|-
|[[File:ConcaveLens.png|center|100px]]
|[[File:ConcaveLensSymbol.png|center|100px]]
|-
| style="height:20px; width:200px; text-align:center;" |A picture of a '''concave lens'''.
| style="height:20px; width:200px; text-align:center;" |The symbol used in [[diagram]]s to represent a '''concave lens'''
|}
===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]].
===Focal Length of a Concave Lens===
{| class="wikitable"
|-
|[[File:ConcaveLensFocalPoint.png|center|500px]]
|-
| style="height:20px; width:200px; text-align:center;" |A '''concave lens''' causes [[parallel]] [[Light Ray|rays]] to [[diverge]]. The [[Focal Point|focal point]] for the '''concave lens''' is on the same side of the [[lens]] as the [[object]].
|}
: The [[Focal Length|focal length]] of a '''concave lens''' is the distance between the [[Focal Point|focal point]] and the centre of the [[lens]]. However, this cannot be [[measured]] through experiment.
===Ray Diagrams===
{| class="wikitable"
|-
|[[File:ConcaveRayDiagram.png|center|500px]]
|-
| style="height:20px; width:200px; text-align:center;" |A [[Ray Diagram|ray diagram]] for a '''concave [[lens]]'''.
In this [[diagram]]:
"Ray 1" is traced backwards after being [[refract]]ed by the [[lens]].
"Ray 2" is shown passing through the centre of the [[lens]]. This ray is also traced backwards.
The [[diagram]] shows that a [[diminish]]ed [[Virtual Image|virtual image]] is produced at the point that the 'traced' lines from "ray 1" and "ray 2" cross one another.
|}