Questions and Answers of College Physics A Strategic Approach 2nd

Explain why ambulances have the word "AMBULANCE" written backward on the front of them.
A student ray diagram Figure Q18.13 but forgets to label the object, the image, or the type of lens used. Using the diagram, draws draws the shown in explain whether the lens is converging or
A laser beam in air is incident on a liquid at an angle of 37° with respect to the normal. The laser beam's angle in the liquid is 26°. What is the liquid's index of refraction?
A diamond is underwater. A light ray enters one face of the diamond, then travels at an angle of 30° with respect to the nor-mal. What was the ray's angle of incidence on the diamond?
You are 2.4 m from a plane mirror, and you would like to take a picture of yourself in the mirror. You need to manually adjust the focus of the camera by dialing in the distance to what you are
A real image of an object can be formed by A. A converging lens. B. A plane mirror. C. A convex mirror. D. Any of the above.
An object is 40 cm from a converging lens with a focal length of 30 cm. A real image is formed on the other side of the lens, 120 cm from the lens. What is the magnification?A. 2D B. 3.0 C. 4D D.
A dentist uses a curved mirror to view the back side of teeth on the upper jaw. Suppose she wants an erect image with a magnification of 2.0 when the mirror is 1.2 cm from a tooth. (Treat this
An object is 50 cm from a diverging lens with a focal length of -20 cm. How far from the lens is the image, and on which side of the lens is it? A. 14 cm, on the same side as the object B. 14 cm,
An object is 6 cm in front of a convex mirror with a focal length of 10 cm. Use ray tracing to determine the location of the image. Is the image upright or inverted? Is it real or virtual?
Starting 3.5 m from a department store mirror, Suzanne walks toward the mirror at 1.5 m/s for 2.0 s. How far is Suzanne from her image in the mirror after 2.0 s?
Figure P18.43 shows a light ray incident on a polished metal cylinder. At what angle θ will the ray be reflected? FIGURE P18.43 R J R2
You slowly back away from a plane mirror at a speed of 0.10 m/s. With what speed does your image appear to be moving away from you?
You shine your laser pointer through the flat glass side of a rectangular aquarium at an angle of incidence of 45°. The index of refraction of this type of glass is 1.55. a. At what angle from the
A ray of light traveling through air encounters a 1.2-cm-thick sheet of glass at a 35° angle of incidence. How far does the light ray travel in the glass before emerging on the far side?
If you look at a fish through the corner of a rectangular aquarium you sometimes see two fish, one on each side of the corner, as shown in Figure P18.49. Sketch some of the light rays that reach your
What is the angle of incidence in air of a light ray whose angle of refraction in glass is half the angle of incidence?
What is the smallest angle θ1, for which a laser beam will undergo total internal reflection on the hypotenuse of the glass prism in Figure P18.54?Figure P18.54 30° 60% 09
A swimmer looks upward from the bottom of a 3.0-m-deep swimming pool. The end of the diving board is directly above him, 2.0 m above the water's surface. How far from the swimmer does the board
A microscope is focused on an amoeba. When a 0.15-mm- thick cover glass (n = 1.50) is placed over the amoeba, by how far must the microscope objective be moved to bring the organ- ism back into
A ray diagram can be used to find the location of an object if you are given the location of its image and the focal length of the mirror. Draw a ray diagram to find the height and position of an
The image produced by a converging lens is typically a different size from the object itself. However, for a lens with focal length of there is one object distance that will yield an image the same
A 2.0-cm-tall object is located 8.0 cm in front of a converging lens with a focal length of 10 cm. Use ray tracing to deter- mine the location and height of the image. Is the image upright or
A near-sighted person might correct his vision by wearing diverging lenses with focal length f = -50 cm. When wearing his glasses, he looks not at actual objects but at the virtual images of those
A 1.0-cm-tall object is 20 cm in front of a converging lens that has a 10 cm focal length. Use ray tracing to find the position and height of the image. To do this accurately, use a ruler or paper
A 2.0-cm-tall object is 20 cm in front of a converging lens that has a 60 cm focal length. Use ray tracing to find the position and height of the image. To do this accurately, use a ruler or paper
A 1.0-cm-tall object is 7.5 cm in front of a diverging lens that has a 10 cm focal length. Use ray tracing to find the position and height of the image. To do this accurately, use a ruler or paper
A 1.6-m-tall woman stands 2.0 m in front of a convex fun house mirror with a focal length of 2/3 m. Use ray tracing to determine the location and height of her image.
A 2.0-cm-diameter spider is 2.0 m from a wall. Determine the focal length and position (measured from the wall) of a lens that will make a half-size image of the spider on the wall.
On a sunny summer day, with the sun overhead, you can stand under a tree and look on the ground at the pattern of light that has passed through gaps between the leaves. You may see illuminated
The human eye has a lot in common with a pinhole camera, being essentially a small box with a hole in the front (the pupil) and "film" at the back (the retina). The distance from the pupil to the
A student has built a 20-cm-long pinhole camera for a science fair project. She wants to photograph the Washington Monument, which is 167 m (550 ft) tall, and to have the image on the film be 5.0 cm
A pinhole camera is made from an 80-cm-long box with a small hole in one end. If the hole is 5.0 m from a 1.8-m-tall per- son, how tall will the image of the person on the film be?
Many cameras have a zoom lens. This is a lens whose focal length and distance from the film can be varied. If the camera's exposure is correct when the lens has a focal length of 8.0 mm, will it be
A photographer uses his camera, whose lens has a 50 mm focal length, to focus on an object 2.0 m away. He then wants to take a picture of an object that is 40 cm away. How far, and in which
A nature photographer taking a close-up shot of an insect replaces the standard lens on his camera with a lens that has a shorter focal length and is positioned farther from the film. Explain why he
A camera takes a perfectly exposed picture when the lens diaphragm is set to f/4 and the shutter speed is 1/250 s. If the diaphragm is changed to f/11, what should the new shutter speed be so that
In Figure P19.6 the camera lens has a 50 mm focal length. How high is the man's well-focused image on the film? FIGURE P19.6 Camera 10 m 2.0 m
The CCD detector in a certain camera has a width of 8 mm. The photographer realizes that with the lens she is currently using, she can't fit the entire landscape she is trying to photograph into her
All humans have what is known as a blind spot, where the optic nerve exits the eye and no light-sensitive cells exist. To locate your blind spot, look at the figure of the cross. Close your left eye
A telephoto lens with focal length of 135 mm has f-numbers ranging from f/2.8 to f/22. What is the diameter of the lens aperture at these two f-numbers?
You have lenses with the following focal lengths: f = 25 mm, 50 mm, 100 mm, and 200 mm. Which lens or pair of lenses would you use, and in what arrangement, to get the highest- power magnifier,
A farsighted person has a near point of 50 cm rather than the normal 25 cm. What strength lens, in diopters, should be pre- scribed to correct this vision problem?
An 8-year-old child and a 75-year-old man both use the same magnifier to observe a bug. For whom does the magnifier more likely have the higher magnification? Explain.
A nearsighted woman has a far point of 300 cm. What kind of lens, converging or diverging, should be prescribed for her to see distant objects more clearly? What power should the lens have?
The relaxed human eye is about 2 cm from front to back. If the iris of the human eye can be opened to 7 mm at its widest, what is the f-number of the human eye?
The near point for your myopic uncle is 10 cm. Your own vision is normal; that is, your near point is 25 cm. Suppose you and your uncle hold dimes (which are 1.7 cm in diameter) at your respective
A pair of binoculars has a magnification of 7X. What would be their magnification if you were to look through them the wrong way, that is, through one of their objective lenses instead of the
For a patient, a doctor prescribes glasses with a converging lens having a power of 4.0 D. a. Is the patient nearsighted or farsighted? b. If the patient is nearsighted, what is the location of her
Is the wearer of the glasses in Figure Q19.14 nearsighted or far- sighted? How can you tell? FIGURE Q19.14
Rank the following people from the most nearsighted to the most farsighted, indicating any ties: A. Bernie has a prescription of +2.0 D. B. Carol needs diverging lenses with a focal length of -0.35
A magnifier has a magnification of 5x. How far from the lens should an object be placed so that its (virtual) image is at the near-point distance of 25 cm?
A farsighted man has a near point of 40 cm. What power lens should he use as a magnifier to see clearly at a distance of 10 cm without wearing his glasses?
An inexpensive microscope has a tube length of 12.0 cm, and its objective lens is labeled with a magnification of 10x.a. Calculate the focal length of the objective lens. b. What focal length
A nearsighted person has a near point of 20 cm and a far point of 40 cm. When he is wearing glasses to correct his distant vision, what is his near point? A. 10 cm B. 20 cm C. 40 cm D. 1.0 m
A standard biological microscope is required to have a magnification of 200x. a. When paired with a 10X eyepiece, what power objective is needed to get this magnification? b. What is the focal
The distance between the objective and eyepiece lenses in a microscope is 20 cm. The objective lens has a focal length of 5.0 mm. What eyepiece focal length will give the microscope an overall
For the combination of two identical lenses shown in Figure P19.24, find the position, size, and orientation of the final image of the 2.0-cm-tall object. FIGURE P19.24 2.0 cm 14 36 cm f = 9.0 cm 15
In a darkened room, red light shines on a red cup, a white card, and a blue toy. The cup, card, and toy will appear, respectively, A. Red, red, blue. B. Red, white, blue. C. Red, red, black. D.
For the combination of two lenses shown in Figure P19.25, find the position, size, and orientation of the final image of the 1.0-cm-tall object. FIGURE P19.25 f = 5.0 cm 1.0 cm 14 4.0 cm f= -8.0
An amateur astronomer looks at the moon through a tele- scope with a 15-cm-diameter objective. What is the minimum separation between two objects on the moon that she can resolve with this telescope?
A researcher is trying to shoot a tranquilizer dart at a 2.0-m- tall rhino that is 150 m away. Its angular size as seen through the rifle telescope is 9.1°. What is the magnification of the
A ray of white light strikes the surface of a 4.0-cm- thick slab of flint glass as shown in Figure P19.31. As the ray enters the glass, it is dispersed into its constituent colors. Estimate how far
The objective lens of the refracting telescope at the Lick Observatory in California has a focal length of 57 ft. a. What is the refractive power of this lens? b. What focal length (mm) eyepiece
A narrow beam of light with wavelengths from 450 nm to 700 nm is incident perpendicular to one face of a 40.00° prism made of crown glass, for which the index of refraction ranges from n = 1.533 to
Jason uses a lens with focal length of 10.0 cm as a magnifier by holding it right up to his eye. He is observing an object that is 8.0 cm from the lens. What is the angular magnification of the lens
A magnifier is labeled "5X." What would its magnification be if used by a person with a near-point distance of 50 cm?
A 20 x microscope objective is designed for use in a microscope with a 16 cm tube length. The objective is marked NA = 0.40. What is the diameter of the objective lens?
A lens with a focal length of 25 cm is placed 40 cm in front of a lens with a focal length of 5.0 cm. How far from the second lens is the final image of an object infinitely far from the first lens?
A microscope with a 5x objective lens images a 1.0-mm- diameter specimen. What is the diameter of the real image of this specimen formed by the objective lens?
Your task in physics lab is to make a microscope from two lenses. One lens has a focal length of 10 cm, the other a focal length of 3.0 cm. You plan to use the more powerful lens as the objective,
A 20X objective and 10x eyepiece give an angular magnification of 200x when used in a microscope with a 160 mm tube length. What magnification would this objective and eyepiece give if used in a
The objective lens and the eyepiece lens of a telescope are 1.0 m apart. The telescope has an angular magnification of 50. Find the focal lengths of the eyepiece and the objective.
Your telescope has an objective lens with a focal length of 1.0 m. You point the telescope at the moon, only to realize that the eyepiece is missing. Even so, you can still see the real image of the
Two stars have an angular separation of 3.3 X 10-6 rad. What diameter telescope objective is necessary to just resolve these two stars, using light with a wavelength of 650 nm?
The planet Neptune is 4.5 x 1012 m from the earth. Its diameter is 4.9 × 107 m. What diameter telescope objective would be necessary to just barely see Neptune as a disk rather than as a point of
What is the angular resolution of the Hubble Space Telescope's 2.4-m-diameter mirror when viewing light with a wave- length of 550 nm? The resolution of a reflecting telescope is calculated exactly
The normal human eye has maximum visual acuity with a pupil size of about 3 mm. For larger pupils, acuity decreases due to increasing aberrations; for smaller pupils, acuity decreases due to
Microtubules are filamentous structures in cells that maintain cell shape and facilitate the movement of molecules within the cell.
A glass rod is charged to +5.0 nC by rubbing. a. Have electrons been removed from the rod or protons added? Explain. b. How many electrons have been removed or protons added?
What is alike about charges when we say "two like charges"? Do they look, smell, or taste the same?
A plastic rod is charged to -20 nC by rubbing. a. Have electrons been added to the rod or protons removed? Explain. b. How many electrons have been added or protons removed?
Suppose you have 1.0 mol of O2 gas. How many coulombs of positive charge are contained in the atomic nuclei of this gas?
When you take clothes out of the drier right after it stops, the clothes often stick to your hands and arms. Is your body charged? If so, how did it acquire a charge? If not, why does this happen?
Figure Q20.8 shows a positively charged rod held near, but not touching, a neutral metal sphere. a. Add plusses and minuses to the figure to show the charge distribution on the sphere. b. Does the
Two identical metal spheres A and B are connected by a metal rod. Both are initially neutral 1.0 × 1012 electrons are added to sphere A, then the connecting rod is removed. After- ward, what are the
Two identical metal spheres A and B are connected by a plastic rod. Both are initially neutral. 1.0 × 1012 electrons are added to sphere A, then the connecting rod is removed. Afterward, what are
You are given two metal spheres on portable insulating stands, a glass rod, and a piece of silk. Explain how to give the spheres exactly equal but opposite charges.
A small plastic sphere with a charge of -5.0 nC is near another small plastic sphere with a charge of -12 nC. If the spheres repel one another with a force of magnitude 8.2 x 10-4 N, what is the
A honeybee acquires a positive electric charge as it flies. through the air. This charge causes pollen grains to be attracted to the bee. Explain, using words and diagrams, how a neutral, conducting
A metal rod A and a metal sphere B, on insulating stands, touch each other as shown in Figure Q20.12. They are origi- nally neutral. A positively charged rod is brought near (but not touching) the
In Figure P20.15, charge q2 experiences no net electric force. What is q1? FIGURE P20.15 91 10 cm -2.0 nC 10 cm 92
A small metal bead, labeled A, has a charge of 25 nC. It is touched to metal bead B, initially neutral, so that the two beads share the 25 nC charge, but not necessarily equally. When the two beads
Object A, which has been charged to +10 nC, is at the origin. Object B, which has been charged to -20 nC, is at (x, y) = (0.0 cm, 2.0 cm). What are the magnitude and direction of the electric force
When DNA breaks into fragments in a cell, electrostatic forces may actually inhibit repair. Explain why this happens.
What are the strength and direction of the electric field 2.0 cm from a small glass bead that has been charged to +6.0 nC?
A 30 nC charged particle and a 50 nC charged particle are near each other. There are no other charges nearby. The electric force on the 30 nC particle is 0.035 N. The 50 nC particle is then moved
A-10 nC charge is located at the origin. a. What are the strengths of the electric fields at the positions (x, y) = (0.0 cm, 5.0 cm), (-5.0 cm, -5.0 cm), and (-5.0 cm, 5.0 cm)? b. Draw a field
Two lightweight, electrically neutral conducting balls hang from threads. Choose the diagram in Figure Q20.23 that shows how the balls hang after:a. Both are touched by a negatively charged rod. b.
All the charges in Figure Q20.26 have the same magnitude. In which case does the electric field at the dot have the largest magnitude? A. C. FIGURE Q20.26 B. D.

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