When a light beam travels from a point A above a swimming pool to a point B below the water (Figure 28), it chooses the path that takes the least time. Let v₁ be the velocity of light in air and v₂ the velocity in water (it is known that v₁ > v₂). Prove Snell’s Law of Refraction:

Transcribed Image Text:

A h₁ sin 0₁ VI sin 0₂ V2 0₁ 1 10₂ T T M₂ B