Question

A plane wave travelling in air is normally incident on a block of paraffin with εr = 2.2.Find reflection coefficient.

Answer 1

Answer:

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Answer 2

The correct answer is 0.19.

Given: $E_{r}$ = 2.2 and E(of air) = 1.

To Find: Reflection of coefficient.

Solution:

Reflection coefficient in terms of direction constant is termed as

T = $\frac{ \sqrt{E_{2} }-\sqrt{E_{1} }}{\sqrt{E_{2} }+\sqrt{E_{1} }}$

= $\frac{\sqrt{2.2}-\sqrt{1} }{\sqrt{2.2}+\sqrt{1} }$

= $\frac{1.48-1}{1.48+1}$

= $\frac{0.48}{2.48}$

T = 0.19

Hence, the reflection coefficient is 0.19.

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