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1 Exam 3 Review Name TRUE/FALSE. Write 'T' if the statement is true and 'F' if the statement is false. 1) An electromagnetic wave is a result of electric and magnetic fields acting together. T 1) 2) Electromagnetic waves do not require a medium to be transmitted. T 2) 3) Accelerated charges radiate electromagnetic waves. T 3) 4) The ratio of the electric field to the magnetic field in the electromagnetic wave is the speed of the light. T 4) 5) The intensity of the radiation field of an antenna is inversely proportional to the distance from the antenna. F 5) 6) The reflection of light from a rough surface is called specular reflection. F 6) 7) A concave mirror is also known as a diverging mirror. F 7) 8) Magnification is positive for inverted images. F 8) 9) The difference between a camera and the human eye is that a camera utilizes a fixed focal length lens and the eye does not. T 9) 10) A convex lens always produces a virtual image. F 10) 11) Farsightedness can be corrected with a converging lens. T 11) 12) The far point of a normal human eye is infinity. T 12) 13) A magnifying glass can be made from a diverging lens. F 13) 14) The focal length of the objective of a telescope is much longer than the focal length of the eyepiece. T 14) MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 15) In an electromagnetic wave the E and B fields are oriented such that 15) A) they are parallel to one another and parallel to the direction of wave propagation. B) they are perpendicular to one another and perpendicular to the direction of wave propagation.xxx C) they are parallel to one another and perpendicular to the direction of wave propagation. D) they are perpendicular to one another and parallel to the direction of wave propagation. E) None of the above answers is correct. 1

2 16) The direction of propagation of electromagnetic waves is given by the 16) A) right and left hand rules. B) right hand rule.xxx C) left hand rule. D) None of the other answers given is correct. 17) Which one of the following is not an electromagnetic wave? 17) A) UV B) sound wavesxxx C) radio waves D) gamma rays E) infrared 18) The energy density of an electromagnetic wave is 18) A) entirely in the magnetic field. B) 1/4 in the electric field and 3/4 in the magnetic field. C) equally divided between the magnetic and the electric fields.xxx D) 1/4 in the magnetic field and 3/4 in the electric field. E) entirely in the electric field. 19) The distance between the two planets is m. How much time would the light signal take to go from one planet to the other? A) sxxx B) s C) s D) s E) None of the other answers is correct. 19) FIGURE ) For an xyz-coordinate system shown in Figure 25-2, if the E-vector is in the +z direction, and the B-vector is in the +x direction, what is the direction of propagation of the electromagnetic waves? A) +yxxx B) +x C) -x D) -y E) +z 20) 2

3 21) A car is approaching a radio station at a speed of 25.0 m/s. If the radio station broadcasts at a frequency of 74.5 MHz, what change in frequency does the driver observe? A) 64.5 Hz B) 6.21 HzXXX C) 98.3 Hz D) 726 Hz E) 67.0 Hz 22) A Doppler weather radar operates at a frequency of 3.40 GHz. The wave from this radar system reflects from an approaching weather system moving with a speed of 39.0 m/s. What is the difference in frequency between the outgoing and returning waves? A) 351 Hz B) 419 Hz C) 670 Hz D) 322 Hz E) 442 HzXXX 21) 22) 23) How far does a beam of light travel in one full year? 23) A) m B) m C) m D) mxxx E) m 24) A laser beam takes 24 ms to be reflected from the surface of a planet. How far from the laser source is this planet's surface? A) m B) m C) mxxx D) m E) m 25) The maximum value of the electric field in an electromagnetic wave is 1.5 V/m. What is the maximum value of the magnetic field associated with this wave? A) 4.0 nt B) 7.0 nt C) 6.0 nt D) 5.0 nt E) 3.0 nt 24) 25) 26) The average intensity of the sunlight in Miami, Florida, is 1060 W/m2. What is the average value of the force exerted on a 16 m2 surface that absorbs this light? A) N B) N C) NXXX D) N/m2 E) N 26) 3

4 27) An mW laser beam emits a cylindrical beam of light mm in diameter. What is the maximum value of the magnetic field? A) T B) TXXX C) T D) T E) T 28) A 60.0 W light bulb radiates light uniformly in all different directions. What is the value of E at a distance of m from the bulb? A) 106 N/CXXX B) 162 N/C C) 52.9 N/C D) 212 N/C E) 82.1 N/C 27) 28) 29) The wavelength of a certain portion of microwaves is 40 mm. What is its frequency? 29) A) 40 GHz B) 0.75 GHz C) 7.5 GHzXXX D) 4.0 GHz E) 75 GHz 30) Which of the following sets of characteristics describes the image formed by a plane mirror? 30) A) virtual and inverted B) real and inverted C) real and upright D) virtual and uprightxxx E) All of the previous statements can be correct. 31) The perpendicular distance from the center of curvature to a spherical mirror is called 31) A) the center of curvature. B) twice the radius of curvature. C) the focal length. D) the perpendicular axis. E) the radius of curvature.xxx 32) A beam of light that is parallel to the principal axis is incident on a concave mirror. What happens to the reflected beam of light? A) It also is parallel to the principal axis. B) It passes through the center of curvature of the mirror. C) It is perpendicular to the principal axis. D) It passes through the focal point of the mirror.xxx E) It passes between the focal point and the center of curvature of the mirror. 32) 4

5 33) A beam of white light goes through dispersion in a prism. The color that bends the most is 33) A) yellow. B) violet.xxx C) red. D) green. E) orange. 34) The critical angle for a beam of light passing from water into air is This means that all light rays with an angle of incidence greater than this angle will be A) totally polarized. B) partially reflected and partially transmitted. C) totally reflected.xxx D) totally transmitted. E) absorbed. 34) 35) Which of the following is a correct statement? 35) A) A convex mirror always produces a virtual image.xxx B) A concave mirror always produces a virtual image. C) A convex mirror always produces a real image. D) A concave mirror always produces a real image. E) All of the previous statements can be correct. 36) An object is located 3.8 m in front of a plane mirror. The image formed by the mirror appears to be 36) A) 1.9 m behind the mirror's surface. B) 3.8 m behind the mirror's surface.xxx C) on the mirror's surface. D) 1.9 m in front of the mirror. E) 3.8 m in front of the mirror. 37) A ray of light strikes a plane mirror perpendicular to the mirror. What is the angle of reflection? 37) A) 360 B) 270 C) 0 XXX D) 180 E) 90 38) The reflecting surfaces of two plane mirrors are perpendicular to each other. How many images of himself will a person standing at a certain distance from the intersection of these mirrors see? A) 3XXX B) 4 C) 5 D) 2 E) 1 38) 39) The focal length of a concave mirror is 20 cm. What is its radius of curvature? 39) A) 10 cm B) -20 cm C) 20 cm D) 40 cmxxx E) -40 cm 40) An object 4.0 cm in height is placed 8.0 cm in front of a concave mirror with a focal length of 10.0 cm. What is the position of its image in relation to the mirror and what are its characteristics? A) 40.0 cm on the other side of mirror, real, 6.0 times bigger B) 10.0 cm on the other side of mirror, virtual, 10.0 times bigger C) 10.0 cm on the same side of mirror, real, 6.0 times bigger D) 40.0 cm on the other side of mirror, virtual, 5.0 times biggerxxx E) 18.0 cm on the same side of mirror, virtual, 2.25 times bigger 40) 5

6 41) John's face is 20 cm in front of a concave shaving mirror of focal length 30 cm. How large an image does he observe? A) half as large as his face B) four times as large as his face C) three times as large as his facexxx D) of the same size as his face E) twice as large as his face 42) An object is placed 50 cm in front of a concave mirror with a focal length of 25 cm. What is the magnification? A) -1.0XXX B) -1.5 C) -2.0 D) -2.5 E) ) 42) 43) The index of refraction of a certain medium is 1.5. What is the speed of light in that medium? 43) A) m/s B) m/sxxx C) m/s D) m/s E) m/s 44) A ray of light in air enters a glass surface at right angles to the surface. What is the angle of refraction? A) 360 B) 90 C) 0 XXX D) 180 E) ) 45) An object is placed 10 cm from a convex lens of focal length 20 cm. What is the magnification? 45) A) 2.0XXX B) 0.50 C) 2.5 D) 1.0 E) ) A beam of light in water (n = 1.33) enters a glass slab (n = 1.50) at an angle of incidence of What is the angle of refraction? A) 60.0 B) 27.5 C) 50.2 XXX D) 39.8 E) ) A 4.0-cm-tall object is placed 50.0 cm from a diverging lens of focal length 25.0 cm. What is the nature and location of the image? A) A virtual image, 1.3 cm tall, 16.7 cm same side as the objectxxx B) A virtual image, 4.0 cm tall, 20 cm other side of the object C) A real image, 1.3 cm tall, 16.7 cm same side as the object D) A real image, 4.0 cm tall, 20 cm other side of the object E) A virtual image, 2.0 cm tall, 10 cm other side of the object 46) 47) 48) The length of time the shutter is open when the film is exposed in a camera is determined by the 48) A) focal length of the lens.. B) diameter of the aperture. C) f-stop. D) shutter speed.xxx E) focusing. 6

7 49) The back of a person's eye is too close to the lens. This person is suffering from 49) A) spherical aberration. B) chromatic aberration. C) farsightedness.xxx D) nearsightedness. E) astigmatism. 50) You have a choice between two lenses of focal lengths fa and fb = 2fa to use as objective lens in building a compound microscope. If the magnification you obtain using lens A is Ma, what will be the magnification when using lens B? A) Mb = 8Ma B) Mb = Ma/2XXX C) Mb = 4Ma D) Mb = Ma/4 E) Mb = 2Ma 50) 51) Which one of the following is not a characteristic of a simple two-lens astronomical refracting telescope? A) The final image is virtual. B) The angular size of the final image is larger than that of the object. C) The objective forms a virtual image.xxx D) The final image is inverted. 51) 52) Do mirrors suffer from chromatic aberration? 52) A) Yes, every optical instrument suffers from it. B) No, because the angle of reflection is always equal to the angle of incidence.xxx C) Yes, because of their specular dispersion. D) None of the previous choices is correct. 53) The deviation of a lens from its ideal behavior is referred to as 53) A) chromatic aberration. B) spherical aberration. C) achromatic aberration. D) an aberration.xxx E) None of the other choices is correct. 54) What type of lens is a magnifying glass? 54) A) convergingxxx B) diverging C) cylindrical D) achromatic E) spherical 55) What is the focal length of the corrective contact lens needed by a nearsighted person whose far point is 60 cm? A) +60 cm B) +130 cm C) -30 cm D) -60 cmxxx E) +30 cm 55) 7

8 56) A camera lens has a focal length of 50.0 mm and an aperture setting of What is the aperture diameter of this lens? A) 13.6 mm B) 14.2 mm C) 15.0 mm D) 12.5 mmxxx E) 10.1 mm 56) 57) What is the power of the combined lenses with individual powers of 8.0 diopters and 4.0 diopters? 57) A) 12 dioptersxxx B) 32 diopters C) 2.0 diopters D) 4.0 diopters E) 24 diopters 58) A nearsighted person has a far point that is 4.2 m from his eyes. What focal length lenses must he use in his contact lenses to allow him to focus on distant objects? A) 4.2 m B) -4.2 mxxx C) -5.2 m D) 5.2 m E) 4.8 m 59) What power contact lens must be used to correct the vision of a nearsighted person whose far point is 40 cm? A) 4.0 diopters B) -2.5 dioptersxxx C) -3.6 diopters D) -4.0 diopters E) 2.5 diopters 60) A person can read the newspaper when it is held at 60 cm from his eyes. What should the focal length of his contact lenses be to allow him to read the newspaper comfortably at a distance of 30 cm? A) +90 cm B) -30 cm C) +60 cmxxx D) -60 cm E) +30 cm 61) A magnifying glass produces an angular magnification of 7. What is the focal length of this lens if a person whose near point is 28 cm reads a book using this magnifying glass? A) 4 cmxxx B) 3 cm C) 2 cm D) 6 cm E) 5 cm 62) What is the magnification of a magnifying glass of focal length 4.0 cm if the image is to be viewed by a relaxed eye with a near point of 25 cm? A) 4.0 B) 2.0 C) 3.0 D) 3.6 E) 6.3XXX 63) A magnifying glass uses a converging lens with a refractive power of 20 diopters. What is the magnification if the image is to be viewed by a relaxed eye with a near point of 25 cm? A) 1.0 B) 3.0 C) 5.0XXX D) 4.0 E) ) 59) 60) 61) 62) 63) 8

9 64) The length of a telescope is 2.20 m and the focal length of the eyepiece is 1.9 cm. What is the focal length of the objective? A) 111 cm B) 41 cm C) 218 cmxxx D) 16 cm E) 45 cm 65) The length of the telescope is 1.60 m and it has a magnification of What is the focal length of the objective? A) 96.0 cm B) 128 cm C) 157 cmxxx D) 100 cm E) 60.0 cm 66) The distance between the object and the eyepiece of a compound microscope is 25.0 cm. The focal length of its objective lens is cm and the eyepiece has a focal length of 2.60 cm. What is the total magnification of the microscope when used by the person of normal eyesight? A) -772 B) -1070XXX C) -520 D) -204 E) ) The focal lengths of the objective and the eyepiece in a microscope are 0.29 cm and 2.5 cm, respectively. An object is placed 0.3 cm from the objective. The image of this object is viewed with the eyepiece adjusted for minimum eyestrain. What is the distance between the objective and the eyepiece? A) 11.5 cm B) 9.85 cm C) 11.2 cmxxx D) 10.1 cm E) 10.4 cm 64) 65) 66) 67) 9

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