why does a ray of light falling perpendicular to a glass slab passes undeviated.

Asked by godmummymother | 30th Oct, 2009, 03:54: PM

Expert Answer:

We measure the angle of incidence, i, as the angle from the normal. If it's zero, i.e. the ray falls perpendicular to the glass slab, sin i is zero. And according to Snell's law sin r is also zero, i.e. the refraction angle r measured from normal is zero. Therefore, the ray is undeviated.

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Answered by  | 3rd Nov, 2009, 06:10: PM

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