the given diagram is for refraction of light through rectangular glass slab. is it correct? if yes, what is the value of angle of incidence?
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Yes, the diagram is correct as when the light falls perpendicular on the glass slab, it goes without any refraction. The angle of Incidence here is 0° because it is the angle made by the Incident Ray and the Normal (90°) at the point of Incidence and as the Incident coming perpendicular or lie on the normal itself, the angle of incidence is 0°
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