12. Unpolarised light of intensity lo is incident on a series of three polarising filters. The axis of the second filter is oriented at 45° to that of the first filter, while the axis of the third filter is oriented at 90° to that of the first filter. What is the intensity of the light transmitted through the third filter? A. 1o/2 B. 2lo C. 4lo D. 1/8
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- 2. Unpolarized light of intensity 100 mW/m² passes through two filters. The first filter has an alignment of 30.0 degrees from the vertical. The intensity of the light that passes through the second filter is 41 mW/m². What is the angular alignment of the second filter with respect to the vertical? [2] A. 5° B. 10° C. 15° D. 20° E. 25° F. 30° 3. Which waves travel slowest in vacuum? [1] A. red light B. blue light E. They all travel with the same speed. C. x-rays D. gamma-rays 4. Point out the incorrect statement with respect to an electromagnetic wave in vacuum (or air) [2]. A. The color depends on the wavelength. B. The energy is transported with speed c in the direction of propagation. C. Both the electric field and the magnetic field exist in a plane perpendicular to the direction of propagation. D. The electric and the magnetic fields change in time, but do not change with position in space. E. The electric field vector and the magnetic field vector are always perpendicular to each…A vertically polarized light wave passes through the five polarizers as shown. Rank in order, from largest to smallest, the transmitted intensities Ia to Ie.10. A ray of light with a wavelength of 480 nm strikes a very thin soap film of thickness 2.00 nm, with air on each side of the film. Which statement is true? a. There will be constructive interference because the path difference is effectively zero, and phase change occurs at only one surface. b. There will be destructive interference because the path difference is effectively zero, and phase change occurs at only one surface. c. There will be constructive interference because the path difference is effectively zero, and phase change occurs at either surface. d. There will be destructive interference because the path difference is effectively zero, and phase change does not occur at either surface.
- 2. a Please answer the following with a clear, readable and correct solution.7The wavelength limits of human vision are 400 nm to 700 nm. A. Find the minimum frequency of light that human can see underwater? The speed of light in water is 1.33 times less than in the air. B. Find the maximum frequency of light that human can see underwater? The speed of light in water is 1.33 times less than in the air. C.Find the minimum wavelenght of light that human can see underwater? The speed of light in water is 1.33 times less than in the air. D. Find the maximum wavelenght of light that human can see underwater? The speed of light in water is 1.33 times less than in the air. (Item 4)