phys notes sept., 23 - location of images underwater-In...

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Refraction is the bending of a ray after it enters a medium where its speed is different. - A ray going from a fast medium to a slow medium bends towards the normal to the surface of the medium. If you are going form slow to fast it bends away from the normal. -The speed of light in a medium is v=c/n, where n is a number larger than on called the index of refraction and c=3 x 10^8 m/s - n= 1.3 for glass - n= 1.5 for water -Hence, a ray going into a medium with a higher index of refraction bends towards the normal and a ray going into a medium with slower index of refraction bends away from the normal Marching army analogy for ray bending towards the normal as light crosses a sharp boundary to a slower medium. Ray-bending together with our psychological straight-ray interpeation determine the
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Unformatted text preview: location of images underwater-In order to observe the fiush from outside the water a transmitted ray must enter your eye.-- You will think it comes from a point obtained by traceing it backwards-- Extend any 2 of the many many transmitted rays from the nose of the fist backwards to find the image of the nose of the fist (where they intersect)-the location of the image will be the same for any observer outside of the water. Fig 2.49-The precise amount of bending is determined by the law of refraction ( sometimes called Snell’s law. Total internal reflection is an extreme case of a ray bending away from the normal as it goes from a higher to a lower index of refraction medium (from a slower to a faster medium....
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