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• Vacuum, defined as 1
• Air, 1.0008
• Water, 1.33
• Glass, 1.5
• Diamond, 2.2

Wiki MarkupThe index of refraction is a way of expressing how optically dense a medium is. The actual index of refraction (other than in a vacuum) depends on the incoming wavelength. Different wavelengths have slightly different speeds in (non-vacuum) mediums. For example, red slows down by a certain amount, but violet slows down by a slightly lower amount - meaning that red light goes through a material (glass, for example) a bit faster than violet light. Red light exits first\[4\]. \\first(#8.).

When wave enters from one medium to another, the wave speed changes but the frequency of the wave remains the same, meaning that the speed of wave depend upon the change in wavelength according to the formula    v=fλ                  eq….2.

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<ac:structured-macro ac:name="anchor" ac:schema-version="1" ac:macro-id="b780cc89865d3763-993dfaa1-4f3e47b7-a0e7bd1a-8b21434051ec8df08190bcc0"><ac:parameter ac:name="">3.</ac:parameter></ac:structured-macro> 3. _Reflection and Its Importance_. (n.d.).  Retrieved December 10, 2012, from Physics Classroom: \[http://www.physicsclassroom.com/class/refln/u13l1c.cfm\]

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7. Wolfson, R. (2007). Essential University Physics (First ed., Vol. 2). San Francisco, California, United States of America: Pearson Education Inc.

8. Nave, R. (n.d.). Refraction of Light by Water. Retrieved December 10, 2012, from Hyperphysics: http://hyperphysics.phy-astr.gsu.edu/hbase/geoopt/refr2.html#c1^{Image Added}

3.http://hyperphysics.phy-astr.gsu.edu/hbase/geoopt/refr2.html#c1

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