Find the reflection coefficient of a wave with an incident electric field of 5 units and reflected electric field of 2 units.

Find the reflection coefficient of a wave with an incident electric field of 5 units and reflected electric field of 2 units. Correct Answer 0.4

The reflection coefficient is the ratio of the reflected electric field to the incident electric field. Thus τ = Er/Ei. On substituting for Ei = 5 and Er = 2, we get τ = 2/5 = 0.4(no unit).
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