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# Reflection and refraction

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Ch 17 Notes

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### Reflection and refraction

1. 1. Ch 17Reflection and Refraction
2. 2. Reflection Law of reflection - when a light ray strikes a reflecting surface, the angle of reflection equals the angle of incidence
3. 3. Regular vs Diffuse Reflection If the beam of light falls on a smooth surface the rays undergo regular reflection (parallel rays reflect parallel) If the beam of light falls on a rough surface, the rays undergo diffuse reflection (parallel rays do not reflect parallel)
4. 4. Why is it harder to see when driving at night after it has rained? Answer: Because the wet road is a smooth surface and very little light is reflected back to our eyes
5. 5. Are the pages of your book smooth or rough? Answer: They are rough If they were smooth, there would be a lot more glare and it would be harder to read.
6. 6. Refraction  Refraction- the change in speed and direction of light at the boundary between 2 media.  Snells Law: ni sin øi = nr sin ør  When light travels from a less optically dense medium into a more optically dense medium, the speed is reduced and the angle of refraction is smaller than the angle of incidence.  V= c/ nr
7. 7. Total internal reflection  occurs when light passes from a more optically dense medium to a less optically dense medium at such an angle that the angle of refraction is 90 degrees.  Crtitical angle - angle of incidence that causes total internal reflection
8. 8. Dispersion - separation of light into the spectrum of colors  Red light travels fastest; it bends the least; has the smallest index of refraction  Violet light travels the slowest, it bends the most; has the largest index of refraction
9. 9. Rainbows A rainbow is formed when sunlight is dispersed by water droplets.