If light passes from a medium of refractive index $n_1$ (denser) to one of $n_2$ (rarer), the critical angle $ heta_c$

Question

If light passes from a medium of refractive index $n_1$ (denser) to one of $n_2$ (rarer), the critical angle $	heta_c$ is given by —

Accepted Answer

$\sin	heta_c = n_2/n_1$

Answer

$\sin	heta_c = n_1/n_2$

Answer

$\cos	heta_c = n_2/n_1$

Answer

$	an	heta_c = n_1/n_2$

If light passes from a medium of refractive index n1n_1n1​ (denser) to one of n2n_2n2​ (rarer), the critical angle θc\theta_cθc​ is given by —