3. The glare off horizontal surfaces that you see while driving a car on a sunny day can be minimized if you wear sunglasses with polarizer films built into the lenses so that light polarized in a certain direction is not allowed to reach your eyes. Discuss how such sunglasses can reduce glare. Is the polarization axis of the glasses vertical or horizontal?

3. The glare off horizontal surfaces that you see while driving a car on a sunny day can be minimized if you wear sunglasses with polarizer films built into the lenses so that light polarized in a certain direction is not allowed to reach your eyes. Discuss how such sunglasses can reduce glare. Is the polarization axis of the glasses vertical or horizontal?

University Physics Volume 3

17th Edition

ISBN:9781938168185

Author:William Moebs, Jeff Sanny

Publisher:William Moebs, Jeff Sanny

Chapter1: The Nature Of Light

Section: Chapter Questions

Problem 89AP: (a) On a day when the intensity of sunlight is 1.00kW/m2 , a circular lens 0.200 m in diameter...

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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?
(a) Light reflected at 62.5° from a gemstone in a ring is completely polarized. Can the gem be a diamond? (b) At what angle would the light be completely polarized if the gem was in water?
Can a sound wave in air be polarized? Explain.
Determine whether each of the following statements is true (T) or false (F). (a) The angle in Snell's law is measured between the ray and a line perpendicular to the surface. (b) The speed of light in a material increases as the materials index of refraction increases. (c) The ratio v/ of a photons speed to its wavelength has the same value for any index of refraction n. (d) Photons of blue light have a higher energy than photons of red light. (e) A photons energy depends on its brightness.
(a) On a day when the intensity of sunlight is 1.00kW/m2 , a circular lens 0.200 m in diameter focuses light onto water in a black beaker. Two polarizing sheets of plastic are placed in front of the lens with their axes at an angle of 20.0°. Assuming the sunlight is unpolarized and the polarizers are 100% efficient, what is the initial rate of heating of the water in °C/s, assuming it is 80.0% absorbed? The aluminum beaker has a mass of 30.0 grams and contains 250 grams of water. (b) Do the polarizing filters get hot? Explain.
Determine whether each of the following statements is true (T) or false (F). (a) The angle in Snell's law is measured between the ray and a line perpendicular to the surface. (b) The speed of light in a material increases as the materials index of refraction increases. (c) The ratio v/ of a photons speed to its wavelength has the same value for any index of refraction n. (d) Photons of blue light have a higher energy than photons of red light. (e) A photons energy depends on its brightness.
If 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?
To save money on making military aircraft invisible to radar, an inventor decides to coat them with a nonreflective 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?
Unreasonable Results Light traveling from water to a gemstone strikes the surface at an angle of 80.0° and has an angle of refraction of 15.2°. (a) What is the speed at light in the gemstone? (b) What is unreasonable about this result? (c) Which assumptions are unreasonable or inconsistent?
A ray of light passes from one material into a material with a higher index of refraction. Determine whether each of the following quantities increases, decreases, or remains unchanged. Indicate your answers with I, D, or U, respectively. (a) The rays angle with the normal. (b) The lights wavelength. (c) The lights frequency. (d) The lights speed. (e) The photon energy.
In each of the following situations, a wave passes through an opening in an absorbing wall. Rank the situations in order from the one in which the wave is best described by the ray approximation to the one ill which the wave coming through the opening spreads out most nearly equally in all directions in the hemisphere beyond the wall, (a) The sound of a low whistle at 1 kHz passes through a doorway 1 m wide, (b) Red light passes through the pupil of your eye. (c) Blue light passes through the pupil of your eye. (d) The wave broadcast by an AM radio station passes through a doorway 1 m wide, (e) An x-ray passes through the space between bones in your elbow Joint.