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.
Lateral Inversion<br />Image where left and right are swapped.<br />
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 />
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Reflection off a convex mirror<br />F = virtual<br /> focal point<br />
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Reflection off a convex mirror<br />Image is: <br />Virtual<br />Smaller than object<br />Upright<br />
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Reflection off a concave mirror<br />F = real focal point<br />
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Reflection off a concave mirror<br />Type of image formed depends on the distance of the object from the mirror.<br />
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Reflection off a concave mirror<br />If object is between mirror and F image is:<br />Virtual<br />Upright<br />Larger<br />
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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.
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.
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.
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.
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 />
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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 />
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Light through a convex lens<br />f = focal length<br />F = focal point<br />C = optical centre<br />
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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.
Light through a convex lens<br />If an object is further than 2F image is:<br />Real<br />Inverted<br />Smaller <br />
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Light through a convex lens<br />If an object is at 2F image is:<br />Real<br />Inverted<br />Same size<br />
22.
Light through a convex lens<br />If an object is between 2F and F image is:<br />Real<br />Inverted<br />Larger <br />
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Light through a convex lens<br />If an object is between F and C image is:<br />Virtual<br />Erect<br />Larger<br />
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.
Drawing a ray diagram for a convex lens<br />Example 1<br />2<br />1<br />F<br />F<br />3<br />
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Drawing a ray diagram for a convex lens<br />Example 2<br />2<br />F<br />F<br />1<br />
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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.
Drawing a ray diagram for a concave lens<br />Example 1<br />2<br />3<br />F<br />F<br />1<br />
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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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