# #4 - Lecture 4 Light and Color for Nonscientists PHYS 1230...

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Lecture 4 Light and Color for Nonscientists PHYS 1230 Geometrical optics of light rays Shadows, eclipses, pinhole camera

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Concept question The sharpest shadows are from - A) Large bulbs like an overhead projector B) Small bulbs C) Candles D) Other

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Concept question Shadows tell us - A) What direction the light is shining from B) That something is blocking the light C) That light travels in straight lines
Geometrical optics - shadows • To cast a shadow, you need a light from a fairly concentrated source, such as the sun • The best shadows come from a point source, for example a small light source or candle • To figure out the shadow location, we use geometrical optics - light travels in straight lines Which bulb will give the best shadow? A B

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X-rays were first observed and documented in 1895 by Wilhelm Conrad Roentgen, a German scientist who found them quite by accident when experimenting with vacuum tubes. A week later, he took an X-ray photograph of his wife's hand which clearly revealed her wedding ring and her bones. The photograph electrified the general public and aroused great scientific interest in the new form of radiation. Roentgen called it "X" to indicate it was an unknown type of radiation. The name stuck! The first X-Rays

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• Spring '08
• MURNANE,MA

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