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: A '''light ray''' is drawn with a ruler.
: '''Light rays''' always have an arrow on them to show which way the '''light ray''' is going.
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|[[File:LightRays.png|center|200px]]
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| style="height:20px; width:200px; text-align:center;" |The light rays are shown leaving the bulb in straight lines.
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==Key Stage 3==
===Meaning===
A '''light ray''' is a straight line drawn to show how light travels.
===About Light Rays===
: A '''light ray''' is drawn with a ruler.
: '''Light rays''' always have an arrow on them to show which way the '''light ray''' is going.
: '''Light rays''' are drawn on [[Ray Diagram|ray diagrams]] to show how light interacts with a boundary.
{| class="wikitable"