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Terahertz Physics by R. A. Lewis

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11     IMAGING

This chapter calls on maths, but the maths is relatively elementary. The first four sections only require simple geometry. The final sections refer to Fourier transforms, but only at a descriptive level.

Sight is the most complete of our senses. Our eyes detect light. So our eyes are photon detectors. There’s more: our eyes distinguish light of different colours. So our eyes are spectrometers. There’s more: our eyes tell the direction the light is coming from. So our eyes are imaging devices. There’s more: between them, our eyes let us build up a three-dimensional image of the scene we are viewing.

We extend our vision using instruments. For example, the telescope lets us see the distant; the microscope, the small.

We can extend ...

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