3. A coating, 177.4 nm thick, is applied to a lens to minimize reflections. The respective indexes of refraction of the coating and of the lens material are 1.55 and 1.48. What wavelength in air is minimally reflected for normal incidence in the smallest thickness? Draw a diagram as part of your solution. 4. A transparent oil (n = 1.29) spills onto the surface of water (n = 1.33), producing a maximum of reflection with normally incident orange light, with a wavelength of 6.00 X 10-7 m in air. Assuming the maximum occurs in the first order, deter- mine the thickness of the oil slick. Draw a diagram as part of your solution