Note that the Orientation Slice is cut precisely to the (100) before the crystal is rotated and cut at either +.25 degrees and toward the flat, or â.25 degrees and away from the flat (as described in Figure 3).
The era was called the Dark Ages also because we don't have a lot of written sources from that time period, especially from the early part of the dark ages (500 to 800 CE).
The purpose of this lesson on the Dark Ages is to prepare you to: 1  Characterize the period of time known as the Dark Ages. 2  Understand why this period of time was called the Dark Ages. 3  Discuss the controversy surrounding the use of the title 'Dark Ages'.