Question

In the figure shown plane waves are refracted from air to water using Huygen's principle $a,b,c,d,e$ are lengths on the diagram. The refractive index of air with respect to water is in the ratio.

• A. $\frac{a}{e}$
• B. $\frac{b}{e}$
• C. $\frac{b}{d}$
• D. $\frac{d}{b}$

Answer 1

Answer: (D)

$\frac{\text{sin }\text{i}}{\text{sin }\text{r}}=\frac{\frac{\text{b}}{\text{c}}}{\frac{\text{d}}{\text{c}}}=\frac{\text{b}}{\text{d}}$
${\mu }_{\text{a,w}}=\frac{\text{sin}\text{ r}}{\text{sin}\text{ i}}$