Depth of focus describes the image location range where the image is clear when focused by an optical system. Outside this range, the image will be significantly blurry. However, within this few millimeter range, the image appears quite sharp. When working with a multiple lens system, it is essential to first calculate the position of the image formed by the first lens. Only after locating the …
Following conflicting desires for an Aztec crown, this book explores the possibilities of repatriation. In The Contested Crown, Khadija von Zinnenburg Carroll meditates on the case of a spectacular feather headdress believed to have belonged to Montezuma, the last emperor of the Aztecs. This crown has long been the center of political and cultural power struggles, and it is one of the most cont…
The human eye is very good at discerning when objects are moving from side to side. If you see your drone moving sideways towards a tree then you know to do something about it. However, once the your drone is a certain distance from you, it becomes almost impossible to tell not only how far away it is, but also whether it is even moving forwards or backwards. Naturally, this increases the chanc…
Alice was beginning to get very tired of sitting by her sister on the bank, and of having nothing to do: once or twice she had peeped into the book her sister was reading, but it had no pictures or conversations in it, ‘and what is the use of a book,’ thought Alice ‘without pictures or conversation?’