New technology that can read pages of a closed book

The difference in refractive index - the degree to which they bend light - between the air and the paper means that the boundary between the two will reflect terahertz radiation back to a detector.

In the new system, a standard terahertz camera emits ultrashort bursts of radiation, and the camera's built-in sensor detects their reflections.

From the reflections' time of arrival, the algorithm can gauge the distance to the individual pages of the book.

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