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1 | |
A negative magnification results whenever the image is virtual. |
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| | A) | True |
| | B) | False |
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2 | |
A virtual image cannot be formed on a screen. |
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| | A) | True |
| | B) | False |
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3 | |
Images formed by convex spherical mirrors are always virtual, erect, and enlarged. |
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| | A) | True |
| | B) | False |
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4 | |
For concave spherical mirrors, the magnification is always greater than 1 when the object is located between the center of curvature and the focal point. |
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| | A) | True |
| | B) | False |
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5 | |
A plane mirror forms real images. |
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| | A) | True |
| | B) | False |
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6 | |
Objects moving closer and closer to the vertex of a convex mirror form smaller and smaller images. |
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| | A) | True |
| | B) | False |
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7 | |
In a concave shaving mirror, greater magnification is achieved when the object is closer to the focal point. |
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| | A) | True |
| | B) | False |
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8 | |
All virtual images formed by spherical mirrors are erect and
diminished. |
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| | A) | True |
| | B) | False |
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9 | |
A ray parallel to the mirror axis passes through the center of curvature after reflection from a converging mirror. |
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| | A) | True |
| | B) | False |
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10 | |
The radius of curvature is equal to twice the focal length for both concave and convex mirrors. |
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| | A) | True |
| | B) | False |
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11 | |
For a spherical concave mirror, virtual images are formed when the object is located |
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| | A) | between F and C |
| | B) | beyond C |
| | C) | at C |
| | D) | inside F |
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12 | |
Which of the following is not true when an image is formed by an object located between C and F of a concave mirror? |
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| | A) | Negative magnification |
| | B) | Negative image distance |
| | C) | Inverted image |
| | D) | Enlarged image |
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13 | |
The focal point of a convex spherical mirror is |
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| | A) | twice the radius |
| | B) | in front of the mirror |
| | C) | virtual |
| | D) | real |
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14 | |
Which of the following is not true for images formed by a plane mirror? |
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| | A) | Magnification is +1 |
| | B) | Image distance is negative |
| | C) | Right and left are reversed |
| | D) | Images are real |
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15 | |
A source of light 12 cm high is placed 50 cm from a concave mirror of focal length 100 cm. The image distance is |
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| | A) | -100 cm |
| | B) | +100 cm |
| | C) | +50 cm |
| | D) | -50 cm |
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16 | |
An object is placed 10 cm from the vertex of a convex spherical mirror whose radius is 20 cm. The magnification is |
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| | A) | 0.667 |
| | B) | -0.667 |
| | C) | +½ |
| | D) | -½ |
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17 | |
A 6-ft person stands 20 ft from a plane mirror. The shortest mirror required to view the entire image is |
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| | A) | 3 ft |
| | B) | 6 ft |
| | C) | 9 ft |
| | D) | 12 ft |
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18 | |
At what distance must an object be placed to form an image on a screen 30 cm from the vertex of a mirror whose radius is 20 cm? |
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| | A) | 20 cm |
| | B) | 15 cm |
| | C) | 10 cm |
| | D) | 5 cm |
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19 | |
The magnification of a mirror is -1/3. What is the image distance when an object is placed 24 cm from this mirror? |
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| | A) | 8 cm |
| | B) | -8 cm |
| | C) | 12 cm |
| | D) | -12 cm |
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20 | |
What should be the object distance for a concave shaving mirror of radius 3.2 m to form an erect image twice as large as the object? |
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| | A) | 80 cm |
| | B) | 1.6 m |
| | C) | 2.4 m |
| | D) | 3.2 m |
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21 | |
The focal length of a spherical mirror is equal to . |
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22 | |
All images formed by convex mirrors are ,
, and in size. |
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23 | |
Object and image distances must be reckoned as for real objects or images and for virtual ones. |
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24 | |
A magnification less than 0 but greater than -1 means that the image is than the object in size and is also . |
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25 | |
When an object is placed inside the focus of a concave mirror, the image is , , and
in size. |
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26 | |
The magnification is equal to the ratio of the to the and will be for erect images and for inverted images. |
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27 | |
When an object is located at the focal point of a concave mirror, all reflected rays are . |
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28 | |
A ray that proceeds toward the focal point of a concave mirror is reflected . |
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29 | |
A(n) image appears to be formed by actual rays of light, but no rays of light actually pass through it. |
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30 | |
The linear apertures of spherical mirrors should be in comparison with their focal lengths to reduce the effects of . |
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