The critical angle for diamond (n ≈ 2.42) and water (n ≈ 1.33) is appr…

Question

The critical angle for diamond (n ≈ 2.42) and water (n ≈ 1.33) is approximately:

Accepted Answer

A. Diamond ≈ 24.4°, water ≈ 48.75°

i_c = arcsin(1/n).
**Diamond (n=2.42): i_c ≈ 24.4°** (small → most light TIRs → brilliant sparkle).
**Water (n=1.33): i_c ≈ 48.75°**.
**Crown glass (n=1.52): i_c ≈ 41.1°** — basis of 90°/180° reflecting prisms (i_c < 45°).

Answer

Diamond ≈ 48.75°, water ≈ 24.4°

Answer

Both ≈ 45°

Answer

Diamond ≈ 90°, water ≈ 0°

The critical angle for diamond (n ≈ 2.42) and water (n ≈ 1.33) is approximately:

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