During total internal reflection, in which direction does light travel, and with how much loss of intensity?

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1. During total internal reflection, in which direction does light travel, and with how much loss of intensity?

From a rarer to a denser medium, with essentially no loss of intensity

From a denser to a rarer medium, with essentially no loss of intensity

From a rarer to a denser medium, with significant loss of intensity

From a denser to a rarer medium, with significant loss of intensity

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Total internal reflection happens specifically going from a denser medium into a rarer one, beyond the critical angle. As the name suggests, it reflects essentially all of the light’s intensity, with no loss to refraction.