Question 151: Ray Optics

Question

The critical angle of a medium for a specific wavelength, if the medium has relative permittivity 3 and relative permeability $${4 \over 3}$$ for this wavelength, will be :

Accepted Answer

n = $$\sqrt {{\varepsilon _r}{\mu _r}}  = \sqrt {3 	imes {4 \over 3}} $$ = 2
n sin c = 1 sin 90
o
sin c = $${1 \over 2}$$
$$ \Rightarrow $$ c = 30
o

Answer

45°

Answer

15°

Answer

30°

Answer

60°

Ray Optics

The critical angle of a medium for a specific wavelength, if the medium has relative permittivity 3 and relative permeability ${4 \over 3}$ for this wavelength, will be :

Choose the correct answer: