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===Meaning===
A '''cone''' is a [[Cell (Biology)|cell]] in the [[eye]] which can detect [[colour]].
===About Cones===
: [[Human]]s have three different types of '''cone''';
:*Blue - Which is sensitive to blue [[light]].
:*Red - Which is sensitive to red [[light]].
:*Green - Which is sensitive to green [[light]].
==Key Stage 4==
:*Red - Which is sensitive to red [[light]].
:*Green - Which is sensitive to green [[light]].
: When '''cone''' detects [[light]] is creates an [[Electrical Impulse|electrical impulse]] which is sent down the optic nerve to the [[brain]].