$A$ light ray travels from a medium with refractive index $n_1$ to another medium of refractive index $n_2$. If $n_1=2$ and $n_2=\sqrt{3}$,then find the critical angle. (in $^{\circ}$)

  • A
    $15$
  • B
    $30$
  • C
    $45$
  • D
    $60$

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