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==Key Stage 4 Higher==
===Meaning===
A '''convexconcave''' [[lens]] is a shaped piece of [[glass]] that is thickest at the centre edges and thinnest at the edgescentre.
{| class="wikitable"
|-
|[[File:ConcaveLens.png|center|100px]]
|[[File:ConcaveLensSymbolConcaveLensDiagram.png|center|100px]]
|-
| style="height:20px; width:200px; text-align:center;" |A picture of 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]].
{| class="wikitable"
|-
|[[File:ConcaveRayDiagramConcaveRayDiagram1.png|center|500px]]
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| style="height:20px; width:200px; text-align:centerleft;" |A [[Ray Diagram|ray diagram]] for a '''concave [[lens]]'''.
In this [[diagram]]:
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.
|}
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/1471851370/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851370&linkCode=as2&tag=nrjc-21&linkId=01c69b0ae058f809cf636033e6ba793e ''Concave lenses, page 206, GCSE Physics, Hodder, AQA '']
:[https://www.amazon.co.uk/gp/product/1782945563/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945563&linkCode=as2&tag=nrjc-21&linkId=9a1d023a374038e6072f33c4f3cf808b ''Concave lenses, page 71, GCSE Biology; The Revision Guide, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/019835939X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=019835939X&linkCode=as2&tag=nrjc-21&linkId=57e96876985fc39b1a3d8a3e3dc238b6 ''Concave lenses, pages 208-211, GCSE Physics; Third Edition, Oxford University Press, AQA '']
:[https://www.amazon.co.uk/gp/product/1782945970/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945970&linkCode=as2&tag=nrjc-21&linkId=a120d24dcc7cc7a58192069a3aafc1d2 ''Concave lenses, pages 267, 268, 273, 274, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/178294558X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=178294558X&linkCode=as2&tag=nrjc-21&linkId=f0dfb66dafcb0c6e9449e7b1a4ae1ac60 ''Concave lenses, pages 82, 84, GCSE Physics; The Revision Guide, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/1471851370/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851370&linkCode=as2&tag=nrjc-21&linkId=01c69b0ae058f809cf636033e6ba793e ''Concave lenses; refraction of light, page 203, GCSE Physics, Hodder, AQA '']
====OCR====
:[https://www.amazon.co.uk/gp/product/0198359837/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359837&linkCode=as2&tag=nrjc-21&linkId=3c4229e8b023b2b60768e7ea2307cc6f ''Concave (diverging) lenses, pages 162, Gateway GCSE Physics, Oxford, OCR '']
:[https://www.amazon.co.uk/gp/product/1782945687/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945687&linkCode=as2&tag=nrjc-21&linkId=9a598e52189317a20311d7a632747bc9 ''Concave lenses, pages 71, 72, Gateway GCSE Physics; The Revision Guide, CGP, OCR '']