If the incident angle is zero, what is the refracted angle according to Snell's Law?

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Multiple Choice

If the incident angle is zero, what is the refracted angle according to Snell's Law?

Explanation:
At normal incidence, the light hits the boundary straight on, so there is no bending. Snell’s Law says n1 sin i = n2 sin r. With i = 0, sin i = 0, which forces sin r = 0. The only solution is r = 0 degrees, meaning the refracted ray continues along the normal into the second medium. The two other options would require the ray to either travel along the boundary (90 degrees) or involve an undefined/infinite angle, which doesn’t occur when the incident angle is zero. The light simply goes straight through, though its speed changes with the medium.

At normal incidence, the light hits the boundary straight on, so there is no bending. Snell’s Law says n1 sin i = n2 sin r. With i = 0, sin i = 0, which forces sin r = 0. The only solution is r = 0 degrees, meaning the refracted ray continues along the normal into the second medium. The two other options would require the ray to either travel along the boundary (90 degrees) or involve an undefined/infinite angle, which doesn’t occur when the incident angle is zero. The light simply goes straight through, though its speed changes with the medium.

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