COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 24, Problem 19QAP
To determine
Which kind of mirror would be most effective to start a fire using sunlight?
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Which two of the following statements are true?
Select one or more:
a. In the plane mirror the image is symmetrical with the object.
b.
An apparent image of the object can only be seen in the plane mirror.
c. The real image of the object can only be seen in the plane mirror.
Od.
In the plane mirror the image is reduced in comparison of the object.
e. In the plane mirror the image is magnified in comparison of the object
f. The image does not appear in the plane mirror.
g. In the plane mirror the image is asymmetrical in comparison of the object.
U
Can someone explain to me like I'm 5 years
old? My knowledge for optics is very bad.
Thank you.
When the image of an object is formed by a convex mirror, which of the
following statements are always true? Assume a real object.
a. The image is virtual.
b. The image is real.
c. The image is magnified.
d. The image is inverted.
e. None of those statements is always true.
. When an object is placed in front of a concave mirror with a radius of curvature of Rat a
certain distance, an upright image which is 3 times the size of the object is seen. What is
the distance between the object and the mirror?
c.
4R
С.
A.
D. R
3
B.
Chapter 24 Solutions
COLLEGE PHYSICS
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- (i) An object is plated at a position p f from a concave mirror as shown in Figure CQ39.12a, where f is the focal length of the mirror. In a finite time interval, the object is moved to the right to a position at the focal point F of the mirror. Show that the image of the object moves at a speed greater than the speed of light. (ii) A laser pointer is suspended in a horizontal plane and set into rapid rotation as shown in Figure CQ39 12b. Show that the spot of light it produces on a distant screen can move across the screen at a speed greater than the speed of light. (If you carry out this experiment. make sure the direct laser light cannot enter a person's eyes.) (iii) Argue that the experiments in parts (i) and (ii) do not invalidate the principle that no material, no energy, and no information can move faster than light moves in a vacuum. Figure CQ39.12arrow_forwardA periscope (Fig. P23.5) is useful for viewing objects that cannot be seen directly. It can be used in submarines and when watching golf matches or parades from behind a crowd of people. Suppose the object is a distance p from the upper mirror and the renters of the two fat mirrors air separated by a distance h. (a) What is the distance of the final image from the lower mirror? (b) Is the final image real or virtual? (c) Is it upright or inverted? (d) What is its magnification? (e) Does it appear to be left-right reversed? Figure P23.5arrow_forwardA dedicated sports car enthusiast polishes the inside and outside surfaces of a hubcap that is a thin section of a sphere. When she looks into one side of the hubcap, she sees an image of her face 30.0 cm in back of the hubcap. She then flips the hubcap over and sees another image of her face 10.0 cm in back of the hubcap. (a) How far is her face from the hubcap? (b) What is the radius of curvature of the hubcap?arrow_forward
- A 1.80-m-tall person stands 9.00 m in front of a large, concave spherical mirror having a radius of curvature of 3.00 m. Determine (a) the mirrors focal length, (b) the image distance, and (c) the magnification. (d) Is the image real or virtual? (e) Is the image upright or inverted?arrow_forwardWhy is the following situation impossible? At a blind corner in an outdoor shopping mall, a convex mirror is mounted so pedestrians can see around the corner before arriving there and bumping into someone traveling in the perpendicular direction. The installers of the mirror failed to take into account the position of the Sun, and the mirror focuses the Suns rays on a nearby bush and sets it on fire.arrow_forwardSuppose a man stands in front of a mirror as shown in Figure 25.50. His eyes are 1.65 m above the floor, and the top of his head is 0.13 m higher. Find the height above the floor of the top and bottom of the smallest mirror in which he can see both the top of his head and his feet. How is this distance related to the man’s height? Figure 25.50 A full-length mirror is one in which you can see all of yourself. It need not be as big as you, and its size is independent of your distance from it.arrow_forward
- An object 10.0 cm tall is placed at the zero mark of a meterstick. A spherical mirror located at some point on the meterstick creates an image of the object that is upright, 4.00 cm tall, and located at the 42.0-cm mark of the meterstick. (a) Is the mirror convex or concave? (b) Where is the mirror? (c) What is the mirrors local length?arrow_forwardA dance hall is built without pillars and with a horizontal ceiling 7.20 m above the floor. A mirror is fastened flat against one section of the ceiling. Following an earthquake, the mirror is in place and unbroken. An engineer makes a quick check of whether the ceiling is sagging by directing a vertical beam of laser light up at the mirror and observing its reflection on the floor. (a) Show that if the mirror has rotated to make an angle with the horizontal, the normal to the mirror makes an angle with the vertical. (b) Show that the reflected laser light makes an angle 2 with the vertical. (c) Assume the reflected laser light makes a spot on the floor 1.40 cm away from the point vertically below the laser. Find the angle .arrow_forwardThe object in Figure P23.52 is mid-way between the lens and the mirror, which are separated by a distance d = 25.0 cm. The magnitude of the mirrors radius of curvature is 20.0 cm, and the lens has a focal length of 16.7 cm. (a) Considering only the light that leaves the object and travels first toward the mirror, locate the final image formed by this system. (b) Is the image real or virtual? (c) Is it upright or inverted? (d) What is the overall magnification of the image? Figure P23.52arrow_forward
- 1. You are standing 2 m in front of your plane bathroom mirror which hangs on the wall. How far away is your image from you? A. 2 m B. 4 m C. 1 m D. Infinitely far away 2. An object is placed to the left of a lens. If the image of the object is formed on the right side of the lens, which of the following statements must be true? A. The image is upright and the lens must be concave B. The image is inverted and real, and the lens must be convex C. The image is upright and virtual D. The image is upright, and the lens must be convex E. The lens could be concave or convexarrow_forwardWhen focusing the light of the sun onto a plane above a concave spherical mirror, you notice there is a specific distance that focuses the light to the smallest point and achieves the highest temperature above the mirror. What is this distance? a) Twice the radius of curvature b) The radius of curvature c) Half the radius of curvature d) Twice the focal lengtharrow_forwarde 0.0 POSTTEST Multiple Choice: Encircle the letter that corresponds to the correct answer. 1. A man stands 10 m in front of a large plane mirror. How far must he walk before he is 5m away from his image? A. 10 cm B. 7.5 m C. 5 m D. 2.5 m 2. What is the focal length of the mirror if an object 3 cm high is placed at a distance of 8 cm from a concave mirror which produces a virtual image 4.5 cm high? A. 21 cm B. 22 cm D. 23 cm D. 24 cm 3. Which of the following distances should a person hold his face from a concave mirror with a focal length of 25 cm so that it may act as a shaving mirror? A. 45 cm B. 20 cm C. 25 cm D. 30 cm 4. What is the distance of the image if an object is placed at a large distance in front of a concave mirror of a radius of curvature of 40 cm? C. 40 cm B. 30 cm D. 50 cm A. 20 cm 5. What is the distance and the radius of curvature of a convex mirror used as a rear-view mirror in a moving car is 2.0 m? A truck is coming from behind it at a distance of 3.5 m. A. 0.77…arrow_forward
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