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# Snell's law

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### Transcript

• 1. Total Internal Reflection
• 2. Total Internal Reflection
• Occurs when light reflects off of the inside wall of a denser medium (higher index of refraction )
• 3.
• Recall:
• When light passes from a dense material into a less dense medium, light reflects away from the normal
Total Internal Reflection
• 4.
• As the angle of incidence increases , the angle of refraction increases
Total Internal Reflection
• 5. Critical Angle
• At a certain angle, the refracted ray follows a path exactly along the surface of the dense medium
• This angle is called the “ critical angle ”
• 6. Critical Angle
• If the incident ray is increased beyond the critical angle, the light is no longer refracted
• Instead, it is reflected back inside the medium
• This is called “ total internal reflection ”
• 7.
• 8.
• 9.
• 10. Mirages
• Formed by both Total Internal Reflection and Refraction
• Produced when light passes through layers of air with different densities
• 11. Mirage
• 12. Snell’s Law
• 13. Willebrord Snell
• Dutch astronomer & mathematician
• Identified the exact relationship between the angle of incidence and angle of reflection
• 14. Snell’s Law
• n 1 = index of refraction for medium 1
• n 2 = index of refraction for medium 2
•  1 = angle of incidence
•  2 = angle of refraction
• 15.
• 16.