COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 23, Problem 53QAP
To determine
What are the polarization and intensity of the light that emerges from the filter?
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Does the refractive index of a certain material depend on the color of light incident on it? Explain.
When unpolarised light is passed through a polariser, and then through an analyser with its polarising axis at a right angle to the axis of the polariser, the intensity of the remaining light is approximately zero. When a second polarising sheet is placed between the polariser and the analyser, the final intensity is much brighter and clearly non-zero. Explain how this can happen.
3. If you have completely polarized light of intensity 270 mW/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?
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Chapter 23 Solutions
COLLEGE PHYSICS
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- Prove that, if I is the intensity of light transmitted by two polarizing filters with axes at an angle and I is the intensity when the axes are at an angle 90.0, then I+I=I0, the original intensity. (Hint: Use the trigonometric identities cos(90.0)=sin and cos2+sin2=1 .)arrow_forwardCan a sound wave in air be polarized? Explain.arrow_forwardShow 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_forward
- Prove that if I is the intensity of light transmitted by two polarizing filters with axes at an angle and I’ is the intensity when the axes are at an angle 90.0, then I+I=I0, the original intensity. (Hint: Use the trigonometric identities cos 90.0=sinand cos2sin2=1 .)arrow_forwardGRECA METHOD ONLY Two polaroid A and B are kept with their transmission axes at an angle Ѳ with respect to one another. If the transmitted intensity of light It = 0.42 I0 where I0 is the intensity of light on the system to find Ѳ.arrow_forwardThe condition for total polarization, at Brewster's angle, for a reflected beam from the interface between two media is that the reflected beam and the refracted beam are perpendicular to each other (see Figure 23.22). Use this information to determine a formula for Brewster's angle for an interface between vacuum and medium of index of refraction n.arrow_forward
- Two polaroid A and B are kept with their transmission axes at an angle Ѳ with respect to one another. If the transmitted intensity of light It = 0.80I0 where I0 is the intensity of light on the system. Then Ѳ is:arrow_forwardA piece of material, suspected of being a stolendiamond (n=2.42)is submerged in oil of refractive index1.43 and illuminated by unpolarized light. It is found thatthe reflected light is completely polarized at an angle of 62°.Is it diamond? Explainarrow_forwardTwo sheets of ideal polarizing material are placed with their transmission axes at 60.0 to each other. A third polarizing sheet is placed between them with its transmission axis at 30.0° to the axes of the other two. What is the fraction of the incident light intensity that is transmitted, when the middle sheet is removed? ___I0arrow_forward
- A teacher does a demonstration using an overhead projector (I = 1810 lm; units are lumens) and three polarizing discs. She places the first disc directly on the overhead machine, a second disc with its axis of polarization completely aligned with the first, and the third with its axis of polarization of 54 degrees counterclockwise to the second. Calculate the intensity of the light that emerges from the third disc.arrow_forwardPhysics Many nocturnal animals demonstrate the phenomenon of eyeshine, in which their eyes glow various colors at night when illuminated by a flashlight or the headlights of a car (see the photo). Their eyes react this way because of a thin layer of reflective tissue called the tapetum lucidum that is located directly behind the retina. This tissue reflects the light back through the retina, which increases the available light that can activate photoreceptors, and thus improve the animal’s vision in low-light conditions. If we assume the tapetum lucidum acts like a concave spherical mirror with a radius of curvature of 0.750 cm, how far in front of the tapetum lucidum would an image form of an object located 30.0 cm away? Neglect the effects of the other structures of the eye, such as the cornea and lens.arrow_forwardIf you have completely polarized light of intensity 175W/m^2 what will it's intensity be after passing through a polarizing filter with its axis at an 89.5 angle to the light polarization direction. In mW/m^2arrow_forward
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