0
Upcoming SlideShare
×

# Refraction

742

Published on

Published in: Education
0 Likes
Statistics
Notes
• Full Name
Comment goes here.

Are you sure you want to Yes No
• Be the first to comment

• Be the first to like this

Views
Total Views
742
On Slideshare
0
From Embeds
0
Number of Embeds
1
Actions
Shares
0
52
0
Likes
0
Embeds 0
No embeds

No notes for slide

### Transcript of "Refraction"

1. 1. The King David High School<br />Science Department<br />Reflection and Refraction<br />By Mr Jones<br />
2. 2. Reflection<br />For light reflecting off a plane mirror (flat, smooth, shiny):<br />Normal<br />Reflected Ray<br />Incident Ray<br />The normal is a line drawn at right angles (perpendicular) to the surface.<br />i<br />r<br />Mirror<br />=<br />Angle of reflection (r)<br />Angle of incidence (i)<br />
3. 3. Reflection<br />For light reflecting off a plane mirror (flat, smooth, shiny):<br />Mirror<br />=<br />Angle of reflection (r)<br />Angle of incidence (i)<br />
4. 4. Refraction<br />Incident Ray<br />Normal<br />Air<br />Perspex<br />Refracted Ray<br />Normal<br />Emergent Ray<br />
5. 5.
6. 6. Refraction<br /><ul><li>As light passes from a less optically dense material into a more optically dense material it moves towards the normal.
7. 7. As light passes from a more optically dense material into a less optically dense material it moves away from the normal. </li></ul>Normal<br />Incident Ray<br />Less optically dense<br />More optically dense<br />More optically dense<br />Less optically dense<br />Emergent Ray<br />Normal<br />
8. 8.
9. 9.
10. 10.
11. 11.
12. 12.
13. 13. Total Internal Reflection<br /><ul><li>When the angle of incidence is small (less than 42°) most of the light emerges from the Perspex and is refracted away from the normal.
14. 14. A tiny amount of light is reflected at the interface. </li></ul>Incident Ray<br />Reflected Ray<br />i<42°<br />Refracted Ray<br />
15. 15. Total Internal Reflection<br /><ul><li>When the angle of incidence is 42° most of the light is refracted at 90° from the normal (along the interface).
16. 16. Some light is reflected at the interface.
17. 17. 42° is described as the critical angle.</li></ul>Incident Ray<br />42°<br />90°<br />
18. 18. Total Internal Reflection<br /><ul><li>When the angle of incidence is greater than 42° no refraction takes place.
19. 19. All of the light is reflected.
20. 20. This is known as total internal reflection.</li></ul>Incident Ray<br />Reflected Ray<br />i>42°<br />
21. 21. Total Internal Reflection<br />
1. #### A particular slide catching your eye?

Clipping is a handy way to collect important slides you want to go back to later.