1. Diffraction occurs when light
    1. strikes an interface between two media
    2. moves through a magnetic field
    3. encounters a small obstacle or aperture
  2. Light of all wavelengths is diffracted equally.
    1. TRUE
    2. FALSE
  3. Write the name of one common device which incorporates a diffraction grating.
  4. BONUS! Hold an example of a diffraction grating in your hand.