Two lenses are shown in the following figures. The one shown in figure 1 is thinner from the edges and thicker in the middle (centre) while the lens shown in figure 2 is thicker from the edges and thinner in the middle (centre). ALPHALAS GmbH is a German laser manufacturer. As a high-tech laser company, they are offering a wide range of products in the fields of lasers, optics, and laser-related electronics. You have been hired by the said company and as your first assignment you have to repair a laser machine. During the inspection you found out that a lens in missing in that machine due to which the machine is unable to diverge the laser beam. The purpose of the missing lens is to diverge the laser beam. Now you have only two lenses and you have to select one lens among the two (provided in the figures below) for the said job. Which lens will you select and why? Explain your answer with suitable explanation. Also explain how your recommended lens will diverge the laser beam. Draw the diagram where necessary. Figure 1 atamy alamy Figure 2

Hello. I was wondering if I could get help on a study question I am struggling with for my material science class. I would appreciate the help. Thanks.

Suppose NASA sent a robotic craft to explore the deep oceans of Jupiter’s moon, Europa (assume the ocean water has an index of refraction 1.34) . In an attempt to be discrete, NASA applies a coating to the submarine-like craft, to make it indetectable to any creatures in the ocean who can see light with a wavelength of 1200nm. The coating material has anindex of refraction of 1.25.a) Draw a clear physics diagram of the problem.b) Technology only allows for coatings to be 1 micrometer or thicker. What is the thinnest coating that can be applied to the craft to make it invisible at 1200nm.

Material Science