All Questions
4
questions
3
votes
1
answer
536
views
Why certain objects reflect while some refract?
Both reflection and refraction are processes where absorption and re-emission of electromagnetic waves occur, but they differ in the direction of re-emission. What factor particularly decides the ...
user197535
1
vote
1
answer
738
views
Properties of light and refractive index of materials
Why does the refractive index of a material dependent on the wavelenght of light incident on it.
7
votes
2
answers
3k
views
Why Negative refractive index is negative
$n=\sqrt{\epsilon \mu }$
Negative refractive index happens when permittivity ($\epsilon $) and permeability ($\mu $)of a material is negative. My question is, if permittivity and permeabilitity of a ...
- 1,037
15
votes
3
answers
2k
views
Can the speed of light become complex inside a metamaterial?
The speed of light in a material is defined as $c = \frac{1}{\sqrt{\epsilon \mu}}$. There are metamaterials with negative permittivity $\epsilon < 0$ and permeability $\mu < 0$ at the same time. ...
- 9,910