A concave mirror with a focal length of 10 cm creates a real image 30 cm away on its principal axis; the corresponding object is located how far from the mirror? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 20.0 cm 2. 15.0 cm 3. 7.5 cm 4. 5.0 cm
A concave mirror with a focal length of 10 cm creates a real image 30 cm away on its principal axis; the corresponding object is located how far from the.
Mar 31, 2015
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A concave mirror with a focal length of 10 cm creates a real image 30 cm away on its principal axis; the corresponding object is located how far from the mirror?
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1. 20.0 cm
2. 15.0 cm
3. 7.5 cm
4. 5.0 cm
If you stand three feet in front of a plane mirror, how far away would you see yourself in the mirror?
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1. 1.5 ft
2. 3.0 ft
3. 6.0 ft
4. 12.0 ft
A concave mirror forms a real image at 25 cm from the mirror surface along the principal axis. If the corresponding object is at a 10 cm distance, what is the mirror's focal length?
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1. 1.4 cm
2. 16.7 cm
3. 12.4 cm
4. 7.1 cm
If a virtual image is formed along the principal axis 10 cm from a concave mirror with the focal length 15 cm, what is the object distance from the mirror?
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1. 30.0 cm
2. 10.0 cm
3. 12.4 cm
4. 7.1 cm
If a virtual image is formed 10 cm along the principal axis from a convex mirror of focal length -15 cm, what is the object distance from the mirror?
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1. 30.0 cm
2. 10.0 cm
3. 6.0 cm
4. 3.0 cm
If a man's face is 30 cm in front of a concave shaving mirror creating an erect image 1.5 times as large as the object, what is the mirror's focal length?
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1. 12.0 cm
2. 20.0 cm
3. 70.0 cm
4. 90.0 cm
What is the image location of an object 1 m in front of a converging lens of focal length 20 cm?
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1. q = +16.7 cm
2. q = +20.0 cm
3. q = +25.0 cm
4. q = +33.3 cm
A magnifying glass has a convex lens of focal length 15 cm. At what distance from a postage stamp should you hold this lens to get a magnification of +2?
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1. 10.0 cm
2. 7.5 cm
3. 5.0 cm
4. 2.5 cm
A contact lens is made of plastic with an index of refraction 1.50. The lens has an outer radius of curvature of +2.0 cm and an inner radius of curvature of +2.5 cm. What is its focal length?
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1. -20 cm
2. +6.67 cm
3. +10 cm
4. +20 cm
A goldfish is swimming in water (n = 1.33) inside a spherical plastic bowl of index of refraction 1.33. If the goldfish is 10 cm from the front wall of the 15 cm radius bowl, where does the goldfish appear to an observer in front of the bowl?
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1. q = -6 cm
2. q = -7 cm
3. q = -8 cm
4. q = -9 cm
For a diverging lens with one flat surface, the radius of curvature for the curved surface is 10 cm. What must the index of refraction be so that the focal length is -10 cm?
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1. 1.5
2. 2.0
3. 3.0
4. 0.5
A converging lens with two curved surfaces has a front surface with a radius of curvature of 10 cm and the back surface has a radius of curvature of 20 cm and it is made from material with an index of refraction of 2.5. What is the focal length of the lens?
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1. 4.4 cm
2. 13.3 cm
3. -13.3 cm
4. 0.25 cm
For a converging lens with two curved surfaces, the radius of curvature for both surfaces is 10 cm. What must the index of refraction be so that the focal length is also 10 cm?
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1. 1.5
2. 2.0
3. 2.5
4. 3.0
A candle is 49 cm in front of a convex spherical mirror of radius of curvature 70 cm. Where is the image and what is its magnification?
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1. q = -20.4 cm, M = +0.417
2. q = +20.4 cm, M = -0.417
3. q = 122.5 cm, M = +2.50
4. q = -20.4 cm, M = -0.417
An object 2 cm high is placed 10 cm in front of a mirror. What type of mirror and what radius of curvature is needed for an image that is upright and 4 cm tall?
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1. Concave, R = 20 cm
2. Concave, R = 40 cm
3. Convex, R = -10 cm
4. Convex, R = -20 cm
An object is 15 cm from the surface of a spherical Christmas tree ornament that is 5 cm in diameter. What is the magnification of the image?
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1. -0.055
2. +0.033
3. +0.077
4. +0.154
Parallel rays of light that hit a concave mirror will come together?
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1. at the center of curvature.
2. at the focal point.
3. at a point half way to the focal point.
4. at infinity.
A girl is standing in front of a concave mirror. Consider two rays of light, one from her nose and one from her mouth, that are parallel as they are traveling toward the mirror. These rays will come together?
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1. at the focal point.
2. at the center of curvature.
3. at the image point.
4. behind the mirror if she is too close to the mirror.
If atmospheric refraction did not occur, how would the apparent time of sunrise and sunset be changed?
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1. both would be later
2. both would be earlier
3. sunrise would be later and sunset earlier
4. sunrise would be earlier and sunset later
If an object and a piece of paper are separated by a distance d, it is found that a convex lens can be placed between the object and the paper and a clear image of the object can be seen on the paper. What is the minimum value of d compared to the focal length?
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1. d = f/2
2. d = f
3. d = 2f
4. d = 4f
When the reflection of an object is seen in a convex mirror the image will?
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1. always be real.
2. always be virtual.
3. may be either real or virtual.
4. will always be magnified.
When the reflection of an object is seen in a plane mirror, the image is?
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1. real and erect.
2. real and inverted.
3. virtual and erect.
4. virtual and inverted.
When the reflection of an object is seen in a plane mirror, the distance from the mirror to the image depends on?
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1. the wavelength of light used for viewing.
2. the distance from the object to the mirror.
3. the distance of both the observer and the object to the mirror.
4. the size of the object.
If a man wishes to use a plane mirror on a wall to view both his head and his feet as he stands in front of the mirror, the required length of the mirror?
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1. is equal to the height of the man.
2. is equal to one-half the height of the man.
3. depends on the distance the man stands from the mirror.
4. depends on both the height of the man and the distance from the man to the mirror.
When the reflection of an object is seen in a concave mirror the image will?
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1. always be real.
2. always be virtual.
3. may be either real or virtual.
4. will always be magnified.
Two convex thin lenses with focal lengths 10 and 20 cm, respectively, are aligned on a common axis, running left to right, the 10 cm lens being on the left. The lenses are separated by a distance of 20 cm. An object is located at a distance of 15 cm to the left of the 10 cm lens. Where will the final image appear as measured from the 20 cm lens?
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1. -13.3 cm
2. -6.67 cm
3. +6.67 cm
4. +13.3 cm
A convex mirror with a focal length of -20 cm forms an image 15 cm behind the surface. If the object height is 1.2 cm what is the image height?
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1. 0.30 cm
2. 0.75 cm
3. 0.94 cm
4. 3.0 cm
An object placed 12 cm from a concave mirror produces a real image 8 cm from the mirror. If the object is now moved to a new position 18 cm from the mirror, where is the new image located as measured from the mirror?
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1. 3.0 cm
2. 6.5 cm
3. 9.2 cm
4. 14.6 cm
A projector lens is needed to form an image on a screen 10 times the size of its corresponding object. The screen is located 8 m from the lens. What is the required focal length of the lens?
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1. 0.32 m
2. 0.54 m
3. 0.73 m
4. 1.12 m
An object, located 90 cm from a concave lens, forms an image 60 cm from and on the same side of that lens. What is the focal length of the lens?
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1. -36 cm
2. -75 cm
3. -180 cm
4. -150 cm
A convex mirror with focal length of -20 cm forms an image 12 cm behind the surface. Where is the object located as measured from the surface?
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1. 7.5 cm
2. 15 cm
3. 22 cm
4. 30 cm
An object is held at a distance of 12 cm from a convex mirror creating a resultant image that is 1/3 the object size. What is the focal length of the mirror?
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1. -6.0 cm
2. -3.0 cm
3. -9.0 cm
4. -18.0 cm
Two thin lenses of focal lengths 15 and 20 cm, respectively, are placed in contact in an orientation so that their optic axes coincide. What is the focal length of the two in combination?
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1. 8.57 cm
2. 17.5 cm
3. 35 cm
4. 60 cm
Two thin lenses, with focal lengths of 25 and -30 cm, respectively, are placed in contact orientated so that their optic axes coincide. What is the effective focal length of the two in combination?
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1. -2.5 cm
2. 13.6 cm
3. 55 cm
4. 150 cm
A glass block, for which n = 1.48, has a bubble blemish located 6.4 cm from one surface. At what distance from that surface does the image of the blemish appear to the outside observer?
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1. 3.2 cm
2. 4.3 cm
3. 7.6 cm
4. 9.5 cm
Two thin lenses with focal lengths of 15 and 10 cm, respectively, are separated by 35 cm along a common axis. The 15 cm lens is located to the left of the 10 cm lens. An object is now placed 50 cm to the left of the 15 cm lens. What is the magnification of the final image taken with respect to the object?
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1. 0.6
2. 1.2
3. 2.4
4. 3.6
A solid glass sphere with a radius of 5.0 cm and index of refraction of 1.52 has a small coin embedded 3.0 cm from the front surface of the sphere. For the viewer looking at the coin through the glass, at what distance from the front surface of the glass does the coin's image appear to be located?
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1. 2.48 cm
2. 3.20 cm
3. 5.00 cm
4. 6.85 cm
In an ideal case rays coming from an object toward a lens or mirror should be reasonably close to the optic axis. To the extent that this condition is not completely met, which one of the following effects occurs?
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1. spherical aberration
2. mirages
3. chromatic aberration
4. light scattering
A fused combination of a diverging and converging lens pair each made from a different index of refraction glass, is used to reduce the occurrence of which of the following effects?
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1. spherical aberration
2. mirages
3. chromatic aberration
4. light scattering
Reducing the lens aperture size is a scheme one can use to reduce the occurrence of which of the following effects?
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1. spherical aberration
2. mirages
3. chromatic aberration
4. light scattering
Use of a parabolic mirror, instead of one made of a circular arc surface, can be used to reduce the occurrence of which of the following effects?
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1. spherical aberration
2. mirages
3. chromatic aberration
4. light scattering
Which of the following effects is the result of the fact that the index of refraction of glass will vary with wavelength?
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1. spherical aberration
2. mirages
3. chromatic aberration
4. light scattering
An object is placed at a distance of 6 cm from a thin convex lens along its axis. The lens has a focal length of 9 cm. What are the values, respectively, of the image distance and magnification?
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1. -18 cm and 3
2. 18 cm and 3
3. 3 cm and -0.5
4. -18 cm and -3
An object is placed at a distance of 30 cm from a thin convex lens along the axis. If a real image forms at a distance of 10 cm from the lens, what is the focal length of the lens?
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1. 30 cm
2. 15 cm
3. 10 cm
4. 7.5 cm
An object is placed at a distance of 40 cm from a thin lens along the axis. If a virtual image forms at a distance of 50 cm from the lens, on the same side as the object, what is the focal length of the lens?
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1. 22 cm
2. 45 cm
3. 90 cm
4. 200 cm
An object is placed at a distance of 40 cm from a concave lens. If a virtual image appears 10 cm from the lens on the same side as the object, what is the focal length of the lens?
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1. -50.0 cm
2. -13.3 cm
3. -10.0 cm
4. -8.0 cm
An object is placed at a distance of 30 cm from a thin convex lens along its axis. The lens has a focal length of 10 cm. What are the values, respectively, of the image distance and magnification?
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1. 60 cm and 2.00
2. 15 cm and 2.00
3. 60 cm and -0.50
4. 15 cm and -0.50
Atmospheric refraction of light rays is responsible for which one of the following effects?
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1. spherical aberration
2. mirages
3. chromatic aberration
4. light scattering
Which of the following best describes the image of a concave mirror when the object is at a distance greater than twice the focal point distance from the mirror?
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1. virtual, erect and magnification greater than one
2. real, inverted and magnification less than one
3. virtual, erect and magnification less than one
4. real, inverted and magnification greater than one
Which of the following best describes the image of a concave mirror when the object distance from the mirror is less than the focal point distance?
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1. virtual, erect and magnification greater than one
2. real, inverted and magnification less than one
3. virtual, erect and magnification less than one
4. real, inverted and magnification greater than one
Which of the following best describes the image of a convex mirror when the object distance from the mirror is less than the absolute value of the focal point distance?
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1. virtual, erect and magnification greater than one
2. real, inverted and magnification less than one
3. virtual, erect and magnification less than one
4. real, inverted and magnification greater than one
Which of the following best describes the image of a concave mirror when the object is located somewhere between the focal point and twice the focal point distance from the mirror?
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1. virtual, erect and magnification greater than one
2. real, inverted and magnification less than one
3. virtual, erect and magnification less than one
4. real, inverted and magnification greater than one
A 3 cm tall object is placed along the principal axis of a thin convex lens of 30 cm focal length. If the object distance is 40 cm, which of the following best describes the image distance and height, respectively?
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1. 17.3 cm and 7.0 cm
2. 120.0 cm and 9.0 cm
3. 17.3 cm and 1.3 cm
4. 120.0 cm and 1.0 cm
Which of the following best describes the image for a thin convex lens that forms whenever the object is at a distance less than one focal length from the lens?
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1. inverted, enlarged and real
2. erect, enlarged and virtual
3. erect, diminished and virtual
4. inverted, diminished and real
Which of the following best describes the image for a thin concave lens that forms whenever the magnitude of the object distance is less than that of the lens' focal length?
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1. inverted, enlarged and real
2. erect, enlarged and virtual
3. erect, diminished and virtual
4. inverted, diminished and real
Which of the following best describes the image of a plane mirror?
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1. virtual, inverted and magnification greater than one
2. real, inverted and magnification less than one
3. virtual, erect and magnification equal to one
4. real, erect and magnification equal to one
A coin is thrown into a fountain filled to a depth of 40 cm with clear water (n = 1.33). An observer looking straight down through the water surface will perceive the coin to be at what apparent depth?
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1. 53.3 cm
2. 40.0 cm
3. 30.0 cm
4. 20.0 cm
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