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Angle of incidence (Ði) = angle of reflection
(Ðr) |
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incident ray, reflected ray and normal are all
in the same plane (2 dimensional) |
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Regular (specular) reflection |
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incident rays which are parallel will be
reflected parallel |
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produces glare |
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Diffuse reflection |
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incident rays are scattered upon reflection |
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images are easily seen |
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image distance (q) = neg. object distance (p) |
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image size (y’) = object size (y) |
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magnification (M) = +1 |
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image is virtual |
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no light rays actually pass through the mirror |
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it cannot be projected onto a screen |
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right and left are reversed |
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Concave |
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converging |
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positive focal length |
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Convex |
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diverging |
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negative focal length |
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Rays to not focus |
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Due to a relatively large linear aperture
compared to focal length |
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may be corrected by the use of a parabolic
mirror |
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3 principle rays |
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In parallel to the axis of symmetry, reflected
back through the focal point |
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In through the focal point, reflected back
parallel to the axis of symmetry |
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In through the center of curvature, reflected
back upon itself |
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Mirror equation |
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Magnification |
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Make a sketch to estimate the size and location
of the image. Also determine the nature ; is it real or virtual, and is it upright
or inverted. |
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Calculations should verify the nature |
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real images Þ q is a positive value |
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virtual images Þ q is a negative value |
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upright images Þ y’ is a positive value |
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inverted images Þ y’ is a negative value |
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Notes