Critical Angles and Total Internal Reflection (Grade 11 NSC Matric Physical Sciences): Quizzes

All light reflects back into the medium

$90°$

From denser to less dense medium

Angle of incidence > critical angle

$\theta_c = \sin^{-1}\left(\frac{n_2}{n_1}\right)$

$48.8°$

Total internal reflection occurs

Cladding has lower refractive index

Repeated total internal reflection

Endoscopes to see inside the body