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- Unreasonable Results To save money on making military aircraft invisible to radar, an inventor decides to coat them with a non-reflective material having an index of refraction of 1.20, which is between that of air and the surface of the plane. This, he reasons, should be much cheaper than designing Stealth bombers. (a) What thickness should the coating be to inhibit the reflection of 4.00-cm wavelength radar? (b) What is unreasonable about this result? (c) Which assumptions are unreasonable or inconsistent?4. Unpolarized light is incident on two linear polarizers oriented at an angle of 40.0° to each other. a. When unpolarized light passes through a linear polarizer, what percentage of the original intensity passes through the filter? b. If the original unpolarized light has an intensity of 235 W/m², find the intensity after passing through both filters.The refractive index of diamond is 2.419. The speed of light in diamond is: O a. 2.4 x 10 ^ 8 m/s O b. 3 x 10 ^8 m/s O c. 1.54 x 10^8 m/s O d. 1.24 x 10 ^8 m/s
- 1. The refractive index of seawater is 1.345. What is the angle of refraction when light is incident at an angle of 30.00 ? A. 30 degrees B. 37.4 degrees C.45 degrees D. 21.8 degrees If a photon has an energy of 8.6 * 10-19 J, which region of the electromagnetic spectrum does it fall into? A. Infrared B. Visible region C. Ultraviolet region D. Near infrared10. A beam of initially unpolarized light of intensity 723 W/m^2 passes through a series of polarizing filters, each one s axis aligned at a 17.9-degree angle with respect to the previous filter s axis. The beam of light emerging from the final filter in the series has an intensity of 220.1 W/m^2. How many polarizing filters did the beam pass through? 3 12 9 61. A transparent material of thickness 12 mm and index of refraction of 1.3, has an intensity ratio between transmitted light and incident light of 0.75. a) What is the reflectivity, Rof the material? b) What is the thickness of the material if the fraction of transmitted light is 0.63?
- A light beam has a wavelength of 660 nm in a material of refractive index 2.00. In another material of refractive index 3.00, its wavelength will be A. 440 nm B. 660 nm C. 1320 nm D. 990 nm E. 330 nmA light beam has a frequency of 660 MHz in a material of refractive index 2.00. In another material of refractive index 3.00, its frequency will be A. 440 MHz B. 330 MHz C. 660 MHz D. 1320 MHz E. 990 MHzLight with a frequency of 5.85×1014 HzHz travels in a block of glass that has an index of refraction of 1.52. What is the wavelength of the light in vacuum ? What is the wavelength of the light in the glass?
- The sun is 150,000,000 km from earth; its diameter is 1,400,000 km. A student uses a 4.0-cm-diameter lens with f = 10 cm to cast an image of the sun on a piece of paper.a. Where should the paper be placed to get a sharp image?b. What is the diameter of the image on the paper?c. The intensity of the incoming sunlight is 1050 W/m2. What is the power of the light captured by the lens?d. What is the intensity of sunlight in the projected image? Assume that all of the light captured by the lens is focused into the image.3. A beam of light passes through a polarizer and then an analyzer. In this process, the intensity of the light transmitted is reduced to 10% of the intensity of the intensity incident on the analyzer. What is the angle between the axes of the polarizer and the analyzer?a. 18°b. 22°c. 32°d. 68°e. 72°6. If the speed of light in a vacuum is 3 x 108 m/s and that light passes through a diamond with a refractive index of 2.42, what is the speed of light as it passes through a diamond?
