Homework # 13 - Double Slit Pattern Handout Problems: 1. In Young's double-slit experiment, how are two sources of light that remain in phase obtained? 2. Why are no interference bands seen on a screen illuminated by two separate sources of light such as two candles? 3. Laser light is both monochromatic and coherent. What does each of these mean? 4. For the water waves below, what type of interference is occurring at point P? What is the distance AP in terms of 2? Barrier A B Wave Crest motion Trough