Applied Physics (11th Edition)
11th Edition
ISBN: 9780134159386
Author: Dale Ewen, Neill Schurter, Erik Gundersen
Publisher: PEARSON
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Chapter 22, Problem 20RQ
How do Polaroid sunglasses reduce the glare of bright sunlight?
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Why do Polaroid sunglasses reduce glare, whereas nonpolarized sunglasses simply cut down the total amount of light reaching the eyes?
Nonpolarized sunlight hits the pair of sunglasses you're wearing. If we can treat the glasses as an ideal Polaroid filter, how much light is transmitted through the glasses to hit your eye?
how would you use 2 large, circular polaroid filters in front of a circular window as a kind of window shade.
Chapter 22 Solutions
Applied Physics (11th Edition)
Ch. 22 - Prob. 1RQCh. 22 - What property of light determines its color?Ch. 22 - Name the light waves whose wavelengths are (a)...Ch. 22 - What is the apparent color of a green dress in a...Ch. 22 - Prob. 5RQCh. 22 - Prob. 6RQCh. 22 - What is a complementary color? Name the complement...Ch. 22 - How are the primary pigments related to the...Ch. 22 - Prob. 9RQCh. 22 - Prob. 10RQ
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- Can a sound wave in air be polarized? Explain.arrow_forwardWhat angle is needed between the direction of polarized light and the axis of a polarizing filter to cut its intensity in half?arrow_forwardSuppose you put on two pairs of polarizing sunglasses with their axes at an angle of 15.0 . . How much longer will it take the light to deposit a given amount of energy in your eye compared with a single pair of sunglasses? Assume the lenses are clear except for their polarizing characteristics.arrow_forward
- What angle would the axis of a polarizing filter need to make with the direction of polarized light of intensity 1.00kW/m2 to reduce the intensity to 10.0 W/m2?arrow_forwardAn unpolarized beam of light is incident on a stack of ideal polarizing filters. The axis of the first filter is perpendicular to the axis of the last filter in the stack. Find the fraction by which the transmitted beams intensity is reduced in the three following cases. (a) Three filters are in the stack, each with its transmission axis at 45.0 relative to the preceding filter. (b) Four filters are in the stack, each with its transmission axis at 30.0 relative to the preceding filter. (c) Seven filters are in the stack, each with its transmission axis at 15.0 relative to the preceding filter. (d) Comment on comparing the answers to parts (a), (b), and (c).arrow_forwardGive an example of a wave characteristic of light that is easily observed outside the laboratory.arrow_forward
- Show that if you have three polarizing filters, with the second at an angle of 45° to the first and the third at an angle of 90.0° to the first, the intensity of light passed by the first will be reduced to 25.0% of its value. (This is in contrast to having only the first and third, which reduces the intensity to zero, so that placing the second between them increases the intensity of the transmitted light.)arrow_forwardIf you have completely polarized light of intensity 150 W/m2, what will its intensity be after passing through a polarizing filter with its axis at an 89.0° angle to the light's polarization direction?arrow_forwardIf a polarizing filter reduces the intensity of polarized light to 50.0% of its original value, by how much are the electric and magnetic fields reduced?arrow_forward
- The waves from a radio station can reach a home receiver by two paths. One is a straight-line path from transmitter to home, a distance of 30.0 km. The second is by reflection from the ionosphere (a layer of ionized air molecules high in the atmosphere). Assume this reflection takes place at a point midway between receiver and transmitter, the wavelength broadcast by the radio station is 350 m, and no phase change occurs on reflection. Find the minimum height of the ionospheric layer that could produce destructive interference between the direct and reflected beams.arrow_forwardUnreasonable 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?arrow_forwardTwo polarizing sheets P1 and P2 are placed together with their transmission axes oriented at an angle to each other. What is when only 25% of the maximum transmitted light intensity passes through them?arrow_forward
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Polarization of Light: circularly polarized, linearly polarized, unpolarized light.; Author: Physics Videos by Eugene Khutoryansky;https://www.youtube.com/watch?v=8YkfEft4p-w;License: Standard YouTube License, CC-BY