A ray of light enters glass slab after refraction emerges from the other side.
Find the value of ∠i - ∠e ?
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In case of refraction through a rectangular glass slab, the incident and emergent rays are parallel to each other because the angle of emergence ∠e is equal to the angle of incidence ∠i, i.e. ∠e = ∠i.
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Using Snell's Law
The rectangular glass slab used should have perfectly smooth faces. The drawing board should be soft so that pins can be easily fixed on it. The angle of incidence should lie between 30° and 60°. All pins base should be in a straight line.
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