A monochromatic plane wave of frequency Hz propagates in vacuum. Its electric field is linearly polarized along the x‑direction and varies as . When it strikes a perfectly conducting surface at normal incidence, what is the time‑averaged power reflected from the surface?
Answer
Same as incident power.
The correct answer is Same as incident power. — Time‑averaged reflected power is therefore the same as the incident power.
Step-by-step solution
- For a perfect conductor, the reflection coefficient .
- Thus the reflected intensity equals the incident intensity.
- Time‑averaged reflected power is therefore the same as the incident power.
Common mistake: Assuming any loss or partial reflection
Concept tested: Reflection from a perfect conductor
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