If the intensity transmission coefficient at a boundary is 1/100, what is the intensity reflection coefficient?

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Multiple Choice

If the intensity transmission coefficient at a boundary is 1/100, what is the intensity reflection coefficient?

Explanation:
When a wave encounters a boundary, part of its energy can be transmitted and part reflected, and with no absorption the total energy is conserved. If the transmitted intensity is 1/100 of the incident, the remaining 99/100 must be reflected to keep the total at 1. So the intensity reflection coefficient is 99/100. (If there were any absorption, the sum would be less than 1.)

When a wave encounters a boundary, part of its energy can be transmitted and part reflected, and with no absorption the total energy is conserved. If the transmitted intensity is 1/100 of the incident, the remaining 99/100 must be reflected to keep the total at 1. So the intensity reflection coefficient is 99/100. (If there were any absorption, the sum would be less than 1.)

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