QJEEM20Ph9aa6: JEE Main 2020 Physics - Class 12 JEEM20Ph9aa6 Solution: The critical angle of a medium for a specific wavelength, if…

Question

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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 \times {4 \over 3}}

= 2

n sin c = 1 sin 90^o

sin c =

{1 \over 2}

\Rightarrow

c = 30^o

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