A film of soapy water (n = 1.33) on top of a sheet of polystyrene (n = 1.49) has a thickness of 188 nm. What wavelength is most strongly reflected if it is illuminated perpendicular to its surface? (This is the apparent color of the soapy film.) nm Additional Materials O Reading
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- On a sunny day, a person's eye has a diameter of 0.00220 m. Two objects are 48.4 m from the eye. Using 550 nm light, how far apart must they be in order for the eye to resolve them? [? ]m Remember: nano means 10-92.d Please answer the following with a clear, readable and correct solution.Problem 4 A worker is required to identify and inspect an object 1 m away. It is illuminated by a 75-W light source 1 m to his left. The background against which the object is viewed is 1.5 m away. If the reflectances of the object and background are .6 and .5 respectively, what is the contrast? background .5 m object 1 m light 1 m eye
- 2. a Please answer the following with a clear, readable and correct solution.Problem 4 Lenses are often coated with thin films of transparent substances such as MgF2 (n=1.38) to reduce the reflection from the glass surface. How thick a coating is needed to produce a minimum reflection_at the center of the visible spectrum (A=550 nm)? Air Glass MGF2 n2 = 1.38 ng 1.50 n1 = 1.00 Given: A-550 nm 12 n=1.38 Minimum reflection: a (Destructive interference) Thickness of coating: d=?A beam of monochromatic light is diffracted by a slit of width 0.615 mm. The diffraction pattern forms on a wall 1.06 m beyond the slit. The width of the central maximum is 1.85 mm. Calculate the wavelength of the light. 3.32e-4 Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. nm
- RR-1 Any material can separate the different wavelengths present in white light because the index of refraction for each wavelength is slightly different. For red light in water n=1.331, for blue light in water n=1.340. a) Find the angle from the normal in water for red light that enters the water from air at an angle of 80.00⁰. b) Find the angle from the normal in water for blue light that enters the water from air at an angle of 80.00⁰. air n=1.000 water: 80.00⁰ c) Draw a figure like the one shown and show the incident. ray and the refracted rays for both colors. Label the rays as "red" and "blue".iTwo flat glass plates are separated by a distance d = 115 nm. There is a layer of oil between the plates. White light shines directly down on the glass. One ray reflects off the top surface of the top oil layer, and a second ray reflects off the bottom surface of the oil layer. The index of refraction of the glass is n, = 1.63, and the index of refraction of the oil is n. = 1.33. glass oil glass a. For each ray state whether there is a ½2 phase change, or no phase change. ONLY 1 ATTEMPT IS ALLOWED FOR EACH. Ray 1: ---Select--- Ray 2: ---Select--- b. What is the extra path length that Ray 2 must travel in the oil? nm c. What is the longest wavelength of light in a vacuum which will give constructive interference for these two reflected rays? nm