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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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Presentation on theme: "Daily Challenge, 1/7 If light is made of waves and experiences interference, how will the constructive and destructive interference appear to us?"— Presentation transcript:

1 Daily Challenge, 1/7 If light is made of waves and experiences interference, how will the constructive and destructive interference appear to us?

2 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

3 http://sol.sci.uop.edu/~jfalward/lightinterference/lightinterference.html Young’s Double Slit Experiment Thin Film Interference

4 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 1 st, 2 nd, etc. images, are produced λ = d (sin θ n ) / m λ – wavelength of monochromatic light d – grating constant, in length units m – order number θ n – diffraction angle, measured from principal image

5 Daily Challenge, 1/8 Check out the “rainbow glasses” and “snowflake glasses.” Consider the physics of light discussed yesterday. How do these glasses work?

6 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 θ n ) / m λ – wavelength of monochromatic light d – grating constant, in length units m – order number θ n – diffraction angle, measured from principal image

7 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?


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