Two slides of length 12 cm are placed one on top of the other. A thin wedge of air is created between them by placing a thin piece of plastic under one end of the slide on top. When monochromatic, coherent light of wavelength 523 nm is incident on the slides from above, 8 dark bands per centimeter are observed. Calculate the thickness of the plastic. Answer in mm. Do not put units in the blank.

The chart shows the costs and shipping times for materials that a company needs to build a new product. which describes the best trade-off if the company needs to start building their product within the next two years? they should order the domestic materials because it is always best to choose the fastest shipping time. they should order the imported materials because it is always best to choose the lowest cost for materials. since the shipping time is longer, they should order the domestic materials because the additional cost is worth it to get the materials in time. even though the shipping time is longer, they should order the imported materials because they are less expensive and should arrive in plenty of time to build the product.