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# Optics

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### Transcript of "Optics"

1. 1. Real or Virtual?<br />Real images<br />A real image is one which can be produced on a screen and is formed by rays that converge.<br />Imaginary images<br />A virtual image cannot be formed on a screen and is produced by rays which only seem to come from the image.<br />
2. 2. Lateral Inversion<br />Image where left and right are swapped.<br />
3. 3. Upright<br />Inverted<br />
4. 4. Reflection off a plain mirror<br />
5. 5. Reflection off a plain mirror<br />Image is:<br />Virtual.<br />Upright.<br />The same size as object.<br />Laterally inverted.<br />Apparent distance from mirror to image is the same as the distance from the object to the mirror.<br />
6. 6. Reflection off a convex mirror<br />F = virtual<br /> focal point<br />
7. 7. Reflection off a convex mirror<br />Image is: <br />Virtual<br />Smaller than object<br />Upright<br />
8. 8. Reflection off a concave mirror<br />F = real focal point<br />
9. 9. Reflection off a concave mirror<br />Type of image formed depends on the distance of the object from the mirror.<br />
10. 10. Reflection off a concave mirror<br />If object is between mirror and F image is:<br />Virtual<br />Upright<br />Larger<br />
11. 11. Reflection off a concave mirror<br />If object is further than F from the mirror image is:<br />Real<br />Inverted<br />Laterally inverted<br />As the distance is increased the image size decreases.<br />http://www.phys.ufl.edu/~phy3054/light/mirror/applets/cavemir/Welcome.html<br />
12. 12. Drawing a ray diagram for a concave mirror<br />Example 1<br />Draw a ray that travels parallel to the axis towards the mirror and reflects through the focal point in front of the mirror.<br />1<br />F<br />F<br />2<br />Draw a ray that travels through the focal point in front of the mirror and reflects parallel to the axis.<br />
13. 13. Drawing a ray diagram for a concave mirror<br />Example 2<br />1<br />F<br />F<br />Draw a ray that travels parallel to the axis towards the mirror and reflects through the focal point in front of the mirror.<br />Draw a ray that reflects off the centre of the mirror at the same angle it was incident.<br />2<br />
14. 14. Drawing a ray diagram for a convex mirror<br />Example 1<br />1<br />2<br />F<br />F<br />Draw a ray that travels towards the focal point behind the mirror and reflects parallel to the axis.<br />Draw a ray that travels parallel to the axis towards the mirror and reflects in a direction that makes it look like it originated at the focal point behind the mirror.<br />
15. 15. Drawing a ray diagram for a convex mirror<br />Example 2<br />1<br />2<br />F<br />F<br />Draw a ray that travels towards the focal point behind the mirror and reflects parallel to the axis.<br />Draw a ray that travels parallel to the axis towards the mirror and reflects in a direction that makes it look like it originated at the focal point behind the mirror.<br />
16. 16. Light through a concave lens<br />
17. 17. Light through a concave lens<br />Light rays diverge.<br />They appear to originate from a focal point in front of the lens.<br />The image is:<br />Virtual<br />Upright<br />
18. 18. Light through a convex lens<br />f = focal length<br />F = focal point<br />C = optical centre<br />
19. 19. Light through a convex lens<br />Light rays converge to focal point behind lens.<br />Type of image formed depends on the distance of the object from the lens.<br />http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=48<br />
20. 20. Light through a convex lens<br />If an object is further than 2F image is:<br />Real<br />Inverted<br />Smaller <br />
21. 21. Light through a convex lens<br />If an object is at 2F image is:<br />Real<br />Inverted<br />Same size<br />
22. 22. Light through a convex lens<br />If an object is between 2F and F image is:<br />Real<br />Inverted<br />Larger <br />
23. 23. Light through a convex lens<br />If an object is between F and C image is:<br />Virtual<br />Erect<br />Larger<br />
24. 24. Drawing a ray diagram for a convex lens<br />Draw:<br />A ray straight through the centre of the lens.<br />A ray that travels parallel to the axis towards the lens and refracts through the focal point behind the lens.<br />A ray through the focal point in front of the lens that refracts parallel to the axis.<br />
25. 25. Drawing a ray diagram for a convex lens<br />Example 1<br />2<br />1<br />F<br />F<br />3<br />
26. 26. Drawing a ray diagram for a convex lens<br />Example 2<br />2<br />F<br />F<br />1<br />
27. 27. Drawing a ray diagram for a concave lens<br />Draw:<br />A ray straight through the centre of the lens.<br />A ray that travels parallel to the axis which refracts as if it came from the focal point in front of the lens.<br />A ray that travels towards the focal point behind the lens which refracts parallel to the axis.<br />
28. 28. Drawing a ray diagram for a concave lens<br />Example 1<br />2<br />3<br />F<br />F<br />1<br />
29. 29. Drawing a ray diagram for a concave lens<br />Example 2<br />2<br />3<br />F<br />F<br />1<br />
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