Discussion
Consider the following statements about reflection at normal incidence.
1. Equal impedances give no reflection 2. A perfect conductor gives a coefficient of minus one 3. The transmitted amplitude is one minus the reflection coefficient
Answer: A
Correct answer: 1 and 2 only are correct
Statements 1 and 2 are correct: matched impedances give no reflection, and a perfect conductor gives \( \Gamma = -1 \). Statement 3 has the sign wrong - the transmission coefficient is \[ \tau = 1 + \Gamma, \] not \( 1-\Gamma \). The relation looks odd until one notices that the tangential electric field must be continuous, so the transmitted amplitude equals the incident plus the reflected.
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