Question

According to Snell's law, the factor that remains constant for a given pair of media and different angles of incidence and refraction is: $\left[1\text{mark}\right]$

(a) Wavelength
(b) Speed
(c) Frequency
(d) Refractive index

Answer 1

Answer: (d) (Refractive index)$\left[1\text{mark}\right]$

According to Snell's law, the ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant.

$\frac{\sin i}{\sin r}=\text{constant}$
Where $i$ = Angle of incidence
$r$ = Angle of refraction

This constant is the refractive index of the second medium with respect to the first medium.