Practice 15A Answers
-
Upload
joan-maldonado -
Category
Documents
-
view
44 -
download
1
description
Transcript of Practice 15A Answers
![Page 1: Practice 15A Answers](https://reader036.fdocuments.us/reader036/viewer/2022082407/56812b1e550346895d8f135a/html5/thumbnails/1.jpg)
Practice 15A Answers
1. 18.5°2. a) 27.5° b) glycerine (n = 1.47) c)
12.5°3. 1.47
![Page 2: Practice 15A Answers](https://reader036.fdocuments.us/reader036/viewer/2022082407/56812b1e550346895d8f135a/html5/thumbnails/2.jpg)
Physics 15.1Refraction of Light and Snell’s Law
What do you notice about the pencil?
![Page 3: Practice 15A Answers](https://reader036.fdocuments.us/reader036/viewer/2022082407/56812b1e550346895d8f135a/html5/thumbnails/3.jpg)
I. RefractionA. Def – The bending of light as it travels from
one medium to another.1. Must be at an angle other than 90°2. If 90° then no refraction3. Occurs when light’s velocity changes
B. Variables1. Θi = angle of incidence
2. Θr = angle of refraction
![Page 4: Practice 15A Answers](https://reader036.fdocuments.us/reader036/viewer/2022082407/56812b1e550346895d8f135a/html5/thumbnails/4.jpg)
C. Velocity Changes1. cause light rays to speed up or slow down2. Situations
a. High speed lower speed Result = Light is bent towards the normal
![Page 5: Practice 15A Answers](https://reader036.fdocuments.us/reader036/viewer/2022082407/56812b1e550346895d8f135a/html5/thumbnails/5.jpg)
b. Low Speed higher speedResult = Light is bent away from the normal
![Page 6: Practice 15A Answers](https://reader036.fdocuments.us/reader036/viewer/2022082407/56812b1e550346895d8f135a/html5/thumbnails/6.jpg)
Concept Question
When trying to catch a fish, should a pelican dive into the water horizontally in front of or behind the image of the fish it sees?*Answer: Behind of the image, because the light entering the water slows down and is bent towards the normal.
Alaskan Natives
![Page 7: Practice 15A Answers](https://reader036.fdocuments.us/reader036/viewer/2022082407/56812b1e550346895d8f135a/html5/thumbnails/7.jpg)
E. Barrel Rolling Explanation pg. 563
![Page 8: Practice 15A Answers](https://reader036.fdocuments.us/reader036/viewer/2022082407/56812b1e550346895d8f135a/html5/thumbnails/8.jpg)
II. The Law of RefractionA. Index of Refraction – ratio of speed of light in
vacuum to speed of light in a medium.B. Formula n = c / v a. n = index of refraction b. c = speed of light in vacuum c. v = speed of light in mediumC. Table 15-1D. Explains a prism
![Page 9: Practice 15A Answers](https://reader036.fdocuments.us/reader036/viewer/2022082407/56812b1e550346895d8f135a/html5/thumbnails/9.jpg)
III. Snells’s Law
A. Def - the relationship between the angle of incidence and angle of refraction of two materials having different index of refraction.
B. Formula n1 sin(Θ1) = n2 sin (Θ2)
C. Variables1. n = indexes of refraction2. Θ = angles of the rays
![Page 10: Practice 15A Answers](https://reader036.fdocuments.us/reader036/viewer/2022082407/56812b1e550346895d8f135a/html5/thumbnails/10.jpg)
D. Ex: A light ray traveling through air strikes a piece of carbon disulfide at an angle of 25.0° to the normal. Find the angle of refraction.
15.0°