LIGHT (waves)

LIGHT (waves)

1. angles- reflection

   • normal= dotted line
     • 90 degrees from surface
   • law of reflection
     • angle i= angle r
   • virtual image

2. Refractive index

   • bending of light when it enters a different medium
     • if going into a more OD medium toward normal
     • Less OD medium away from normal
   • 'n'
   • n=c/v
     • speed of light in vacume/ SofL in medium
     • n= sini/ sin r
       • snells law

3. total internal reflection

   • light traveling into a LESS OD medium below the critical angle will pass through refracted
     • AT the critical angle light is refracted along the face of the block
       • if angle i is greater then angle c, all light is reflected
   • critical angle
     • SinC= 1/n
   • uses
     • periscope
     • endoscopes
     • optical fibers

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