Aim: How do we explain Snell’s Law?

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Presentation transcript:

Aim: How do we explain Snell’s Law?

Angle of Incidence and angle of refraction

Different angles of refraction for different media

Why do scuba divers wear face masks?

Snell’s Law The index of refraction of the medium in which the light ray is incident multiplied by the sine of the angle of incidence is equal to the index of refraction of the medium in which the light rays refracts multiplied by the sine of the angle of refraction. n1sinθ1 = n2sinθ2

Derivation of Snell’s Law Using Huygen’s Principle

Solving Problems using Snell’s Law The angle of incidence in both cases is 33 degrees. Calculate the angle of refraction in each circumstance. n1sinθ1=n2sinθ2 1sin33°=1.33sinθ2 Θ2=24° 1sin33°=1.52sinθ2 Θ2=21 degrees

Sample Problems 3-4 The angle of incidence in each case is 42 degrees. Calculate the angle of refraction in each problem. n1sinθ1=n2sinθ2 1.52sin42°=1.33sinθ2 Θ2 =50° 1.33sin42°=2.42sinθ2 Θ2 = 21.6°

The Layer Problem Find the angle at which the light enters the air. 42 degrees