snells law states that sin(I)/sin(R)=mu2/mu1 that cannot be 0
so in case of normal incidence sin(I)/sin(R)= 0/0 = 0 so does it violate snells law if not why not?
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Solution
Refraction of light is the phenomenon of change in the path of light in going from one medium to another. When light is incident normally or, perpendicularly on a boundary of two media no refraction occurs and only the refraction angles becomes zero but still snell's law is applicable, since snell's law states that the product of refractive index and sine of angle of incidence at a point in a medium is constant.