1. Diffraction Gratings Diffraction Grating Analysis
Diffraction Grating vs. Double Slit
Double vs. Multi slit
The Grating Equation
Types of Diffraction Grating
Light source and grating
Spectroscope
Application – Spectral Analysis
Application – DVD’s and CD’s

2. Diffraction Grating
A diffraction grating is a device used for wave analysis, ________________

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5. Diffraction Grating vs. Double Slit
Similar to the double slit except:
Grating has more slits  increased light passing through  brighter interference pattern
The maximas are sharper and narrower in grating
________

6. Double Slit vs. Multi Slit
Interference pattern becomes brighter and sharper.
Maxima become narrower and more spread out.

7. Double Slit vs. Multi Slit
Diffraction Grating
_________

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9. The Grating Equation d = distance between slits λ = wavelength
Θ = emergent angle. Different wavelengths will have different Θ.
m = ……………...

10. The Grating Equation
Constructive interference (solid bands) occurs when m = an integer (positive or negative whole number, no fractions). When fractions occur, you get destructive interference and therefore, no bright spot  ___________
Different wavelengths will diffract ……………….

11. Check Your Understanding
At what angle will 638 nm light produce a second-order maximum when passing through a grating of 900 lines/cm?

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13. Check Your Understanding
A diffraction grating with slits 1.00 x 10-5 m apart is illuminated by monochromatic light with a wavelength of 6.00 x 102 nm. Calculate the angle of the third-order maximum.

14. Types of Diffraction Grating
Transmission Grating
The light passes through the slits
Reflection
________

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16. White Light and Grating
If the light striking the grating is not monochromatic but a mixture of wavelengths, each wavelength produces a pattern of bright maxima at different locations on the viewing screen

17. Spectroscope
_________

18. __________
Can be used to determine the atomic makeup of distant objects as different atoms give off different spectrums of light which can be analyzed

19. DVD’s and CD’s
The tracks of a CD or DVD act as a reflection diffraction grating, producing a separation of the colors of white light. The nominal track separation on a CD is 1.6 micrometers, corresponding to about 625 tracks per millimeter.
For red light ………………..