When a ray of light is incident normally (at zero angle of incidence) on the boundary between two different media, it passes from one medium to the other without changing its direction, regardless of whether it is moving from a rarer to a denser medium or vice versa. The angle of incidence is the angle between the incident ray and the normal to the surface. If this angle is zero, the angle of refraction (the angle between the refracted ray and the normal) will also be zero, as predicted by Snell's Law (n1 sinθ1 = n2 sinθ2).
If a ray of light enters from a rarer medium to a denser medium at zero angle of incidence, it would
Asked in UPSC NDA 1 2021 · Topic: Optics (Reflection and Refraction at plane and spherical surfaces)
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