1 / 12

Reflection and Refraction of Waves

Reflection and Refraction of Waves. Important Vocabulary. Incident wave – original wave hitting a surface Angle of incidence – angle of the incident wave Reflected wave – wave that bounces off a surface Angle of reflection – angle at which the wave is reflected

wilson
Download Presentation

Reflection and Refraction of Waves

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Reflection and Refraction of Waves

  2. Important Vocabulary • Incident wave – original wave hitting a surface • Angle of incidence – angle of the incident wave • Reflected wave – wave that bounces off a surface • Angle of reflection – angle at which the wave is reflected • Refracted wave – wave that travels through a medium and is bent by that medium • Angle of refraction – angle at which the wave is refracted

  3. More Important Vocabulary • Converge – waves/rays come together and meet at a certain point • Diverge – waves/rays disperse and move away from a certain point • Convex – curved outward • Concave – curved inward

  4. Law of Reflection • When a ray of light is reflected, the angle of incidence is equal to the angle of reflection θi= θr

  5. Reflection continued… • When an object is reflected, an image is created in the mirror • The image in the mirror is the same distance at which it is reflected

  6. Virtual vs. Real Images • Real Image – waves converge when they hit the mirror • Ex: convex and concave mirrors

  7. Virtual vs. Real Images • Virtual Image – waves diverge when they hit the mirror • Ex: plane mirror

  8. Law of Refraction • Refraction is the bending of waves as it moves from one medium to another medium with a different density • The more dense the medium is, the slower the wave travels • The speed of light in a vacuum is 3 x 108 m/s, so we assume that the speed of light in air is the same because the numbers are so close • c = 3 x 108m/s • c represents the constant of the speed of light

  9. Law of Refraction • The index of refraction is the ratio of the speed of light in a vacuum to the speed of light in the medium n = c/v n = index of refraction c = 3 x 108 m/s v = speed of light in the medium

  10. Law of Refraction • Light bends TOWARD the normal when the optical density is MORE dense • Light bends AWAY from the normal when the optical density is LESS dense n1 = 1 n1 = 1.5 n2 = 1.5 n2 = 1

  11. Law of Refraction • According to the picture and the previous slide, how would you know that water is more dense than air?

  12. Law of Refraction • Snell’s Law – shows mathematical relationship between the angle of incidence and angle of refraction when traveling through different media • (n1)(sin θ1) = (n2)(sin θ2) • n1 = index of refraction in medium 1 • θ1 = angle of incidence • n2 = index of refraction in medium 2 • θ2 = angle of refraction

More Related