1. The problem statement, all variables and given/known data One microscope slide is placed on top of another with their left edges in contact and a human hair under the right edge of the upper slide. As a result, a wedge of air exists between the slides. An interference pattern results when monochromatic light is incident on the wedge. What kind of fringe is seen at the left edges of the slides? A. a dark fringe B. a bright fringe C. a circular fringe D. impossible to determine 2. Relevant equations 2nt=mλ and 2nt=(m+0.5)λ 3. The attempt at a solution A is the correct answer but I honestly have no idea how to approach this.