COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 23, Problem 47QAP
To determine
What is the diameter of the circle of light that a person above the water will see?
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Physics
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.
The 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.
Does the refractive index of a certain material depend on the color of light incident on it? Explain.
Chapter 23 Solutions
COLLEGE PHYSICS
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- Figure 25.49 shows a light bulb between two mirrors. One minor produces a beam at light with parallel lays; the other keeps light from escaping without being put into the beam. Where is the filament of the light in relation to the focal point or radius of curvature of each mirror? Figure 25.49 The two mirrors trap most of the bulb’s light and form a directional beam as in a headlight.arrow_forwardFigure 25.54 shows a ray of light passing from one medium into a second and then a third. Show that 3 is the same as it would be if the second medium were not present (provided total internal reflection does not occur). Figure 25.54 A ray of light passes from one medium to a third by traveling through a second. The final direction is the same as if the second medium were not present, but the ray is displaced by x (Shawn exaggerated).arrow_forwardA transparent sphere of unknown composition is observed to form an image of the Sun on its surface opposite the Sun. What is the refractive index of the sphere material?arrow_forward
- In the H. G. Wellsnovel The Invisible Man, a personbecomes invisible by altering hisindex of refraction to match thatof air. This is the idea behind thedisappearing eyedropper in Conceptual Question 10. If the invisibleman could actually do this, wouldhe be able to see? Explainarrow_forwardIf b is Brewster's angle for light reflected from the top of an interface between two substances, and b is Brewster's angle for light reflected from below, prove that b+b=90.0.arrow_forwardNo light passes through two perfect polarizing filters with perpendicular axes. However, if a third polarizing filter is placed between the original two, some light can pass. Why is this? Under what circumstances does most of the light pass?arrow_forward
- When dots are placed on a page from a laser printer, they must be close enough so that you do not see the individual dots of ink. To do this, the separation of the dots must be less than Raleigh's criterion. Take the pupil of the eye to be 3.0 mm and the distance from the paper to the eye of 35 cm; find the minimum separation of two dots such that they cannot be resolved. How many dots per inch (dpi) does this correspond to?arrow_forwardVerify that the critical angle for light going from water to air is 48.6°, as discussed at the end of Example 25.4, regarding the critical angle for light traveling in a polystyrene (a type of plastic) pipe surrounded by air.arrow_forwardDoes the fact that the light flash from lightning teaches you before its sound prove that the speed of light is extremely large or simply that it is greater than the speed at sound? Discuss how you could use this effect to get an estimate of the speed of light.arrow_forward
- Why is the index of refraction always greater than or equal to 1?arrow_forwardGive an example of a wave characteristic of light that is easily observed outside the laboratory.arrow_forward8. What is the angle of deviation if a ray of light in water is incident at an angle of 50 degrees and the angle of refraction is 35 degrees? Draw & compute.arrow_forward
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