daily challenge, 1/7 if light is made of waves and experiences interference, how will the...
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Daily Challenge, 1/7
If light is made of waves and experiences interference, how will
the constructive and destructive interference appear to us?
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Light shows Interference
Interference is the mutual effect (superposition principle) of two beams of light resulting in a loss of intensity in certain regions (destructive interference) and an increase of intensity of other regions (constructive interference)
Double Slit Interference – standing wave pattern similar to water wave tank
Interference in thin films – occurs due to reflection off front and back of film being slightly out of phase
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http://sol.sci.uop.edu/~jfalward/lightinterference/lightinterference.html
Young’s Double Slit Experiment Thin Film Interference
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Diffraction of Light Diffraction – the spreading of light into a region beyond an obstruction (happens on the scale of wavelength)
Diffraction Gratings – optical surfaces with many parallel, closely spaced grooves when a beam of monochromatic light is passed through… a principal image, along with less intense 1st, 2nd, etc. images, are produced
λ = d (sin θn) / mλ – wavelength of monochromatic lightd – grating constant, in length units m – order numberθn – diffraction angle, measured from principal image
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Daily Challenge, 1/8
Check out the “rainbow glasses” and “snowflake glasses.”
Consider the physics of light discussed yesterday.
How do these glasses work?
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Daily Challenge, 1/9
Minilab: (15 points) Use the diffraction gratings of known spacing to determine the wavelength of a laser. Sketch your experimental setup and show your work.
Remember λ = d (sin θn) / mλ – wavelength of monochromatic lightd – grating constant, in length units m – order numberθn – diffraction angle, measured from principal image
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Physics Daily Challenge, 1/12
The specifications (accepted values) for groove spacing are 1.6 μm/groove on a CD and 0.7 μm/groove on a DVD.If you use a laser of known wavelength and the diffracted reflection images of the laser beam to calculate a groove
spacing of 15,300 Å for a CD, what is the absolute and relative
error of your measurement?