(1) The critical angles for the air is 90⁰,
(2) The critical angles for the polystyrene is 39.1 ⁰ and
(3) The critical angles for the flint glass is 37.2 ⁰.
Critical angles for the different medium
θc = sin⁻¹( 1/η)
where;
- η is the refractive index
Refractive index of air = 1
Refractive index of polystyrene = 1.5865
Refractive index of flint glass = 1.655
Critical angles for air
θc = sin⁻¹( 1/1)
θc = 90⁰
Critical angles for polystyrene
θc = sin⁻¹( 1/1.5865)
θc = 39.1 ⁰
Critical angles for flint glass
θc = sin⁻¹( 1/1.655)
θc = 37.2 ⁰
Thus, the critical angles for the air is 90⁰, the critical angles for the polystyrene is 39.1 ⁰ and the critical angles for the flint glass is 37.2 ⁰.
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