Question

Which value simplifies Snell’s law at the critical angle?

Options

• \[\sin 90^\circ=1\]

• \[\sin 90^\circ=n_1\]

• \[\sin 90^\circ=0\]

• \[\sin 90^\circ=n_2\]

Answer 1

The sine of \[90^\circ\] is \[1\]. Substituting this value reduces the critical-angle equation to \[n_1\sin i_c=n_2\].