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: Mirrors are said to be '''reflective'''.
: If a surface is dull you cannot see an image and it is not called '''reflective''', but it still '''reflects''' the light.
{| class="wikitable"
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|[[File:Periscope Diagram.png|center|500px]]
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| style="height:20px; width:500px; text-align:center;" |A periscope uses the '''reflection''' from two mirrors to see a clear image.
|}