Tag Archives: tutorial

Photographic Light Meter

Which is most sensitive to visible light? A. Human eye B. Photographic plate C. Charged-coupled device D. Hale’s 5-Meter Telescope mirror That’s a trick question. A-C are devices that actually detect light but D just reflects it. Likewise, A-C are small devices but D is huge. I think D doesn’t count since all it does [...]

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