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# Refraction by savannah kennedy

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### Refraction by savannah kennedy

1. 1. Refraction By: Savannah and Trent
2. 2. Objectives • Recognize situations where refraction will occur. • Identify which direction light will bend when it passes from one medium to another.
3. 3. Introduction • In this presentation we will discuss the refraction of light and the situations in which it occurs and why it happens. • We will also discuss how refraction travels through different mediums and how the light bends.
4. 4. Discovery of Refraction • Willebrord van Roijen Snell discovered refraction in the early 1600’s. • However refraction only became known everywhere when Christian Huygens published Snell’s and his own results in “Dioptrica” and got the information out.
5. 5. What is Refraction? • When light passes from one medium into a second medium, the light path bends. • If a substance causes the light to speed up or slow down more, it will refract more.
6. 6. Why Does Refraction Occur? • Refraction occurs when it is at the boundary of a medium and it caused by the change in speed. • Light refracts because it travels at an angle into a substance with a different refractive index.
7. 7. Determining Direction • FST= Fast to Slow, Towards the normal • FSA= Slow to Fast, Away from the normal
8. 8. Examples
9. 9. Examples
10. 10. What is the Refractive Index? • It’s the ratio of velocity of light in two media and hence it is a number without a unit. • The ratio of the speed of light in a vacuum to the speed of light in a medium is called the refractive index of the medium
11. 11. Angle of Incidence • The angle which the incident ray makes with the normal ray at the point of incidence. • The angle of incidence is basicly the angle between the incident ray and the normal.
12. 12. Angle of Refraction • Its the angle that the refracted ray makes with the normal line
13. 13. Angles
14. 14. What is a Lens? • It’s a part of a transparent refracting medium bounded by two spherical surfaces or one curved and one plane surface. • Two types: Biconvex and biconcave.
15. 15. Biconvex Lens • It’s thicker at the middle than it is at the edges. • Parallel rays of light can be focused into a focal point. • This is the kind of lens used for a magnifying glass.
16. 16. Biconcave Lens • Is thinner at the middle than it is at the edges. • Light rays refract outwards and spread apart as they enter the lens and again as they leave.
17. 17. Bibliography • • • Henderson, Tom. "The Cause of Refraction." The Cause of Refraction. Tom Henederson, 2013. Web. 25 Oct. 2013. Serway, Raymond A., and Jerry S. Faughn. "Refraction ." Holt physics. Austin, Tex.: Holt, Rinehart and Winston, 2002. 487-492. Print. Zobel, Edward . "Ray Optics, Light Refraction." Light Refraction. N.p., n.d. Web. 25 Oct. 2013. <http://zonalandeducation.com/mstm/physics/light/rayO ptics/refraction/refraction1.html>.