Question

At the critical angle, what are the angle of incidence and the angle of refraction?

Options

• Angle of incidence \[=i_c\]; angle of refraction \[=90^\circ\].

• Angle of incidence \[=i_c\]; angle of refraction \[=0^\circ\].

• Angle of incidence \[=0^\circ\]; angle of refraction \[=90^\circ\].

• Angle of incidence \[=90^\circ\]; angle of refraction \[=i_c\].

Answer 1

The angle of incidence is the critical angle \[i_c\]. By definition, its corresponding angle of refraction is \[90^\circ\].