Lecture 3 - Lecture 3 Lecture 3 Lateral displacement of a...

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Lecture 3 1 © Jeffrey Bokor, 2000, all rights reserved Lecture 3 Lateral displacement of a ray passing obliquely through a plane parallel glass plate: for small incidence angle This can be used to laterally displace an image. One application of this very simple device is in a spe- cialized high speed camera. The film has to move so fast that it is driven continuously (rather than actually stopping briefly for each frame as in a conventional camera). A rotating plate is used to make the image track the moving film during exposure of a given frame to prevent blur. But the plate introduces aberrations. – Chromatic effect: longitudinal and lateral displacements depend on which is dependent. – For a plate used in convergant or divergent light, the amount of displacement is greater for larger angles which gives spherical aberration. Right Angle Prism I I t D index n Dt I 1 1 I 2 sin n 2 I 2 sin ----------------------- sin = Ii i n 1 n ------------- = n 45 45 common building block in non-dispersive prism devices
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Lecture 3 2
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Lecture 3 - Lecture 3 Lecture 3 Lateral displacement of a...

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