When does the snell\'s law fail

1.	When does the snell\'s law fail
Answer» When it is perpendicular at normal Sin r/sin i At the point of total internal reflection.When the sin of the angle of reflection is greater than one.When light moves from a dense to a less dense medium, such as from water to air, Snell\'s law cannot be used to calculate the refracted angle when the resolved sine value is higher than 1. At this point, light is reflected in the incident medium, known as internal reflection. Before the ray totally internally reflects, the light refracts at the\xa0critical angle

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