PowerPoint Presentation

Its what we see

The Art of Bending Light1Refractionthe bending of light when passing through a new (transparent) substance

2Bending Light: VocabularyIncident RayAngle of IncidenceNormalRefracted RayAngle of Refraction3Optical DensityHow difficult it is for light to move through a substance .High optical density light travels more slowlyLow optical density light travels more quickly

4Optical DensityHow difficult it is for light to move through a substance .High optical density light travels through more slowlyLow optical density light travels through more quickly

5Low to High Optical DensityFST: Fast to Slow Towards the normalWhere is the refracted angle?6Low to much higher Optical DensityFST: Fast to Slow Towards the normalWhere is the refracted angle?7High to lower Optical DensitySFA:Slow to Fast Away from the normalWhere is the refracted angle?8Quick ways to rememberFST = Fast to Slow, Towards NormalFASTFST = Freaky science teachers?

SFA = Slow to Fast, Away From NormalSFA = Sarah Farts a lot? Page 54Where will the light bend?

Which substance has a higher optical density?

What direction do you expect light to bend?Draw the path light takes from the penny to your eye.Why?Imagine rows of hikersFrom dry land to swamp

Hikers in swamp mud slow down

Others stay fast

Result: Change in Angle!

12

Light Traveling from a Fast to a Slow Medium will bend _______ the normal towardsORPierre de FermatFermats PrincipleLight always takes fastest pathSo

14http://politics-and-prose.blogspot.com/2008/03/pierre-de-fermat.html?showComment=1205944500000Fastest PathIs a straight line always the fastest?

Where is light traveling the fastest?

slowfast15Fastest PathIs a straight line always the fastest?

Dashed line is in slow substance for less time and in faster substance for more time.

Bent path is faster overall.

d2d1d1