Total internal reflection: The critical angle in air for a particular type of glass is $39\mathrm{.}039\mathrm{.}0^\backslash$circ$.$ What is the speed of light in this class glass? $($c$=3\mathrm{.}00108$m$/$sc $=3\mathrm{.}00\backslash$times $10^8\backslash ,\backslash$text$\{$m$/$s$\})$

A$)1\mathrm{.}97108$m$/$s$1\mathrm{.}97\backslash$times $10^8\backslash ,\backslash$text$\{$m$/$s$\}$

B$)1\mathrm{.}94108$m$/$s$1\mathrm{.}94\backslash$times $10^8\backslash ,\backslash$text$\{$m$/$s$\}$

C$)1\mathrm{.}91108$m$/$s$1\mathrm{.}91\backslash$times $10^8\backslash ,\backslash$text$\{$m$/$s$\}$

D$)1\mathrm{.}89108$m$/$s$1\mathrm{.}89\backslash$times $10^8\backslash ,\backslash$text$\{$m$/$s$\}$

E$)2\mathrm{.}00108$m$/$s$2\mathrm{.}00\backslash$times $10^8\backslash ,\backslash$text$\{$m$/$s$\}$