Question
Draw a ray diagram to show passage of two rays of light through a rectangular slab of glass, when the angle of incidence is zero in one case and a little less than 90° in the other case.
Solution
For ray I, angle of incidence = 0. So, angle of refraction is also zero. It goes straight without any deviation along path A.
For ray II, angle of incidence ө is close to 90°. It is refracted at angle r and emerges along path B, parallel to path II.
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