Refraction of Light

Refraction of Light

6.1

Refraction of Light

	Refraction of light
	The bending of a light ray at the boundary of two medium as the light ray propagates from a medium to another with difference optical density.

	The speed and direction of light changes when in different medium

Light that moves from less dense to denser medium will refracted towards normal.
Otherwise, the light that moves from denser to less dense medium will refracted away from normal.

	Formula for refraction index, n
	\(n=\dfrac{\text{sin i}^0}{\text{sin r}^0}\), (Snell's law), where \(\text{i}^0\) = incidence angle, \(\text{r}^0\) = refracted angle
	\(n=\dfrac{D}{d}\), where D = real depth, d = apparent depth
	\(n=\dfrac{c}{v}\), where c = velocity of light in air (\(3\times10^8\text{ms}^{-1}\)), v = velocity of light in a medium
	\(n=\dfrac{1}{\text{sin c}^0}\), where \(\text{c}^0\) = critical angle

Refraction of Light

6.1

Refraction of Light

	Refraction of light
	The bending of a light ray at the boundary of two medium as the light ray propagates from a medium to another with difference optical density.

	The speed and direction of light changes when in different medium

Light that moves from less dense to denser medium will refracted towards normal.
Otherwise, the light that moves from denser to less dense medium will refracted away from normal.

	Formula for refraction index, n
	\(n=\dfrac{\text{sin i}^0}{\text{sin r}^0}\), (Snell's law), where \(\text{i}^0\) = incidence angle, \(\text{r}^0\) = refracted angle
	\(n=\dfrac{D}{d}\), where D = real depth, d = apparent depth
	\(n=\dfrac{c}{v}\), where c = velocity of light in air (\(3\times10^8\text{ms}^{-1}\)), v = velocity of light in a medium
	\(n=\dfrac{1}{\text{sin c}^0}\), where \(\text{c}^0\) = critical angle