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When a plane electromagnetic wave from medium 1 (ε1) is incident normally on the surface of a perfect dielectric (i.e. medium 2 with ε2), ...


16. When a plane electromagnetic wave from medium 1 (ε1) is incident normally on the surface of a perfect dielectric (i.e. medium 2 with ε2), then what is the relationship of the electric field strength of the reflected wave (Er) to the electric field strength of the incident wave, (assuming that permeabilities (μ) of known insulators do not differ appreciably from free space i.e. μ1 = μ2 = μ0)

A. Er

Ei = √ε2 - √ε1
√ε1 + √ε2

B. Er

Ei = 2√ε1
√ε1 + √ε2

C. Er

Ei = 2√ε2
√ε1 + √ε2

D. Er

Ei = √ε1 - √ε2
√ε1 + √ε2

Answer: Option D
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