1. Array theorem and convolutions
Derive array theorem from convolution theorem

2. Review: Sketch the diffraction pattern of this rectangular slit
I got it mostly right
I got it mostly wrong but I tried

4. The E-field at the screen due to one slit is (centered at the origin)
Find and sketch the E-field at the screen due to due slits centered at y = ±h/2.
I got it mostly right
I got it mostly wrong but I tried

5. Diffraction of the light from a distant flashlight viewed through a black umbrella fabric.

6. 2-slit Fraun. diffraction pattern

7. N-slits diffraction features
How many minor peaks are between the major peaks?

9. N-slits, grooves,mirror-strips  diffraction grating
major peaks occur when:
minor peaks occur when:

10. N-slits, grooves,mirror-strips  diffraction grating
Ratio of major to minor peak in I:
a) N b) N2 b) N1/2
Width of major peak decreases as what power of N?
a) 1/N b) 1/N2 b) 1/N1/2

11. Diffraction grating orders

12. Diffraction grating orders

13. Reflective gratings are “blazed”
Typical grating for visible to UV light: grooves/mm, 10 cm wide105 lines.
Reflective gratings most common: lines cut in glass, replicated onto plastic blanks, coated with metal (aluminum)

14. Modern methods
Blazed gratings put more light into a nonzero order

15. Resolving power of a grating
How much must l change so peak moves by half its width?

16. Spectrometer
Put slits at f from mirrors. Grating in center