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    Do waves need to approach a boundary at an angle for refraction to occur? If they approached directly head on neither speed nor wavelength would change?
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    Oh,be careful.

    Speed changes when light passes from one medium to another - or at least, to another with a different optical density.

    If they are incident at 90º, or in other words, if they arrive along the normal, the speed will still change. It's only the direction that won't and you can prove this by using 90º as the angle of incidence in your Snell's Law equation.
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    (Original post by phys981)
    Oh,be careful.

    Speed changes when light passes from one medium to another - or at least, to another with a different optical density.

    If they are incident at 90º, or in other words, if they arrive along the normal, the speed will still change. It's only the direction that won't and you can prove this by using 90º as the angle of incidence in your Snell's Law equation.
    ohh okay, so speed and wavelength would still change but direction would remain the same and therefore refraction wouldn't actually occur since it refers to the change in direction?
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    Yes.
 
 
 

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