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: A shadow can be caused by an [[Opacity|opaque]] object blocking the light from any light source like the sun, or a light bulb.
{| class="wikitable"
|+ The length of this '''shadow''' depends on the position of the light source and object.
|-
|[[File:ShadowStick1.png|center|200px]]
|[[File:ShadowStick2.png|center|200px]]
|[[File:ShadowStick3.png|center|200px]]
|-
| style="height:20px; width:200px; text-align:center;" |When the light source is overhead the '''shadow''' is underneath the object.
| style="height:20px; width:200px; text-align:center;" |When the light source gets lower the '''shadow''' gets longer.
| style="height:20px; width:200px; text-align:center;" |The lower the light source, the longer the '''shadow'''.
|}
{| class="wikitable"
|+ The size and shape of a '''shadow''' depends on the position of the light source and object.
|-
|[[File:ShadowCylinder1.png|center|200px]]
|[[File:ShadowCylinder3.png|center|200px]]
|[[File:ShadowCylinder2.png|center|200px]]
|-
| style="height:20px; width:200px; text-align:center;" |When the light source is far away the '''shadow''' is smaller.
| style="height:20px; width:200px; text-align:center;" |When the light source is closer to the object the '''shadow''' is bigger.
| style="height:20px; width:200px; text-align:center;" |If you move the object around you can get a different shaped '''shadow'''.
|}
===Note for Teachers===
In year 7 students frequently answer the following question incorrectly:
Only the sun can cause shadows: True or False? It is unclear where this misconception comes form but teachers should take special care to ensure students consider this question thoughtfully.