Moir patterns, such as those shown in Exercises 6566, can appear when two repetitive patterns overlap to produce a third, sometimes unintended, pattern. a. In

Moiré patterns, such as those shown in Exercises 65–66, can appear when two repetitive patterns overlap to produce a third, sometimes unintended, pattern.

a. In each exercise, use the name of a conic section to describe the moiré pattern.

b. Select one of the following equations that can possibly describe a conic section within the moiré pattern: x² + y² = 1; x² - y² = 1; x² + 4y² = 4.