Determine the theoretical refractive index and thickness of a single film layer deposited on germanium (n = 4.0) such that normal reflectance is zero at a wavelength of 2 µm. %3D What actual material could be used?

Quartz is a uniaxial birefringent material with refractive indices no=1.5534 and ne=1.5443. It is desired to make a quarter-wave plate of quartz for use with a Sodium laser of wavelength λ0=589 nm. Calculate the minimum thickness of the plate.Give your answer in micrometers to 1 d.p.

A thin film of polystyrene n=1.49 coats a piece of glass n=1.55. When illuminated from above, the dominant color of the light reflected to the observer is 473 nanometers wich is blue. What is the minimum thickness of the thin film? A. 317 nm B. 153 nm C. 159 nm D. 305 nm E. 79.4 nm

A microwave dinner has the instructions listed below. In this problem, you will explain how following the instructions affect the heat transfer into the meal. The meal starts off frozen, and is covered with a thin piece of plastic "film" or covering when it is taken out of the box. The vegetables are separate from the beef and potatoes.) Instructions: 1. Cut slit in film over vegetables. 2 Microwave on high 4 minutes. 3. Turn bock film from beef and potatoes. Stir beef and potatoes. Replace film. Return tray to microwave oven. 4. Microwave on high 3 minutes. 5. Let stand 2 minutes in microwave oven. Stir beef and potatoes. a. How does each of the steps above (cut slit in film, stir beef and potatoes, etc) affect the heat transfer to the food? Make sure to consider conduction, convection, and radiation where appropriate. b. The instructions ask you to stir the beef and potatoes, but not the vegetables. From this, what can you tell about how each type of food receives and transfers heat?…