P219lecture16propertiesoflight

# - Goal To understand the basics of reflection and refraction Objectives 1 To understand the Propagation of light 2 To understand the following

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Goal: To understand the basics of reflection and refraction Objectives: 1) To understand the Propagation of light 2) To understand the following possibilities When light hits something: Reflection Refraction Critical Angle Brewster’s Angle 3) To learn about Rainbows

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Propagation of light When light is emitted – even a single photon – it usually goes in all directions. Imagine you are camping on a cold day. You start a fire to warm yourself. What happens if you take a few steps back?
Spreading of light Since light propagates in all 3 dimensions that means it spreads itself out onto the surface of a sphere. Since the area of the outside of this sphere (not volume) relates to the radius squared that means that the light you receive – or energy – drops as the radius squared. So, if you get twice as far away you only get 1/4 th the energy (translation – you get cold).

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When a photon meets a woman, err a surface A few things can happen, and often times you will get all of these in different amounts. 1) reflection – the light in essence bounces off of the surface. In this case the angle which the light leaves is the same as it hits (θr = θi), as is the wavelength of light (in the perspective of the object it is hitting) The % of light that gets reflected depends on the material it is hitting as well as the wavelength of light.
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## This note was uploaded on 12/01/2010 for the course PHYSICS 21900 taught by Professor Rhoads during the Spring '10 term at IUPUI.

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- Goal To understand the basics of reflection and refraction Objectives 1 To understand the Propagation of light 2 To understand the following

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