Total internal reflection requires light to travel from

Question

Accepted Answer

D. {'text': 'a denser medium to a rarer one, with incidence angle > critical angle', 'label': 'D'}

1. TIR occurs when light strikes the boundary going dense → rare.
2. Above the critical angle (sin θc = n_rare / n_dense), no refraction occurs; all light reflects.
3. Going rare → dense never gives TIR — the refracted ray always bends towards the normal.
_Source: NCERT Class 12 Physics Part II, Ch 9 §9.4_

Answer

{'text': 'a denser medium to a rarer one, with incidence angle < critical angle', 'label': 'A'}

Answer

{'text': 'vacuum into glass', 'label': 'B'}

Answer

{'text': 'a rarer medium to a denser one, with any incidence angle', 'label': 'C'}