General Physics L20_color

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Presentation transcript:

General Physics L20_color Group Work Why do cooler objects emit a greater fraction of their energy at long wavelengths (low frequencies)?

General Physics L20_color Light and Color This lecture takes lots of demonstration apparatus: Transmission overhead projector with Diffraction grating after focusing lens Slit mask Square mask CMY filters RGB filters RGB filter wheels Vertical-slit lamp and variac Class set of diffraction gratings R, G, B projectors

General Physics L20_color Today’s Objectives Explain how the human eye identifies colors. Explain how colors are produced by absorption, dispersion, and scattering.

How Human Color Vision Works General Physics L20_color How Human Color Vision Works 424 530 560 Demonstrate R, G, B slide projectors. Secondary colors formed from primaries, white from combination of all three. Source: Griffith, Physics of Everyday Phenomena

General Physics L20_color Question What color do we see when green and red receptors are stimulated equally? A. Cyan. B. Blue. C. Yellow. D. Magenta.

General Physics L20_color Question What color do we see when blue and red receptors are stimulated equally? A. Cyan. B. Blue. C. Yellow. D. Magenta.

Bird and Reptile Color Vision General Physics L20_color Bird and Reptile Color Vision Source: Scientific American, July 2006

Reflection and Transmission General Physics L20_color Reflection and Transmission Demonstrate Color filters R, G, B, C, M, Y with overhead projector slit and diffraction grating. Filters Remove colors from light. Subtractive primary colors C, M Y with square mask and no diffraction grating on the projector. Combinations create additive primary colors and black. (and absorption)

General Physics L20_color Question Chlorophyll absorbs blue and red light. What color does it appear? A. red B. yellow C. green D. violet

General Physics L20_color Question In color printing, which two color inks are combined to make the color orange? Cyan and Magenta. Cyan and Yellow. Yellow and Magenta. Demonstrate with CMY color wheel. Removing the C wheel still leaves a position of orange.

Fluorescent Light Not “Natural” General Physics L20_color Fluorescent Light Not “Natural” Source: www.korry.com/products/nightshield/fluor_light.stm

Colors Split by Dispersion General Physics L20_color Colors Split by Dispersion Source: Griffith, Physics of Everyday Phenomena, 4 ed.

Speed in Glass Depends on l General Physics L20_color Speed in Glass Depends on l Index of refraction n = c/v c = vacuum speed v = speed in medium

General Physics L20_color Question Which is faster in glass? Blue light. Red light. Both have the same speed.

General Physics L20_color Prism Separates White Light Source: Griffith

General Physics L20_color Board Work What is wrong with this famous picture?

Dispersion Creates Rainbows General Physics L20_color Dispersion Creates Rainbows Source: Griffith

Primary Rainbow: 1 Reflection General Physics L20_color Primary Rainbow: 1 Reflection 40° 42° Source: Griffith, Physics of Everyday Phenomena

Secondary Rainbow: 2 Reflections General Physics L20_color Secondary Rainbow: 2 Reflections 54.5° 52° Source: Griffith

General Physics L20_color Viewing Both Rainbows Source: Ackerman and Knox, Meteorology

General Physics L20_color Why the sky is blue and sunsets are red Rayleigh Scattering Why the sky is blue and sunsets are red

General Physics L20_color There probably isn’t time, but this can be demonstrated nicely with a white light beam shining through dilute milk. The scattered light is bluish and the transmitted light is reddish.

Blue Scatters; Red Passes General Physics L20_color Blue Scatters; Red Passes Source: Griffith