Please answer all questions.
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| 1 | |
A farsighted woman cannot see objects clearly that are closer to her eye than 60.0 cm. Determine the focal length and power of the spectacle lenses that will enable her to read a book at a distance of 25.0 cm. |
| | A) | (a) 17.6 cm, (b) +0.0233 D |
| | B) | (a) 0.0233 cm, (b) +.429 D |
| | C) | (a) 0.0567 cm, (b) +4.00 D |
| | D) | (a) 42.9 cm, (b) +2.33 D |
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| 2 | |
A nearsighted man cannot see objects clearly that are beyond 50 cm from his eye. Determine the focal length and power of the glasses that will enable him to see distant objects clearly. |
| | A) | (a) -50 cm, (b) -2.0 D |
| | B) | (a) +50 cm, (b) +2.0 D |
| | C) | (a) -0.02 cm, (b) -0.02 D |
| | D) | (a) +25 cm, (b) -0.5 D |
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| 3 | |
A projection lens is employed to produce 2.4 m x 3.2 m pictures from 3.0 cm x 4.0 cm slides on a screen that is 25 m from the lens. Compute its focal length. |
| | A) | 13.9 cm |
| | B) | 3.2 cm |
| | C) | 30.9 cm |
| | D) | 31.6 cm |
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| 4 | |
A camera gives a life-size picture of a flower when the lens is 20 cm from the film. What should be the distance between lens and film to photograph a flock of birds high overhead? |
| | A) | 10 cm |
| | B) | 20 cm |
| | C) | 5 cm |
| | D) | 40 cm |
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| 5 | |
What is the magnifying power of a lens of focal length +2.0 cm when it is used as a magnifying glass (or simple microscope)? The lens is held close to the eye, and the virtual image forms at the near point, 25 cm from the eye. |
| | A) | 13.5 |
| | B) | 12.5 |
| | C) | 13.0 |
| | D) | 1.08 |
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| 6 | |
When the object distance from a converging lens is 5.0 cm, a real image is formed 20 cm from the lens. What angular magnification is produced by this lens when it is used as a magnifying glass, to form an image at the near point of 25 cm? |
| | A) | 6.2 |
| | B) | 6.5 |
| | C) | 7.2 |
| | D) | 101 |
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| 7 | |
In a compound microscope, the focal lengths of the objective and eyepiece are +0.50 cm and +2.0 cm respectively. The instrument is focused on an object 0.52 cm from the objective lens. Compute the magnifying power of the microscope if the virtual image is viewed by the eye at a distance of 25 cm. (Hint: Find the linear magnification of the objective, and then multiply that by the angular magnification of the eyepiece.) |
| | A) | 365 |
| | B) | 104 |
| | C) | 340 |
| | D) | 390 |
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| 8 | |
The large telescope at Mt. Palomar has a concave objective mirror of diameter of 5.0 m and radius of curvature 46 m. What is the magnifying power of the instrument when it is used with an eyepiece of focal length 1.25 cm? |
| | A) | 1.8 x 103 |
| | B) | 1.8 x 101 |
| | C) | 3.7 x 103 |
| | D) | 5.4 x 10-4 |
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| 9 | |
An astronomical telescope with an objective lens of focal length +80 cm is focused on the moon. By how much must the eyepiece be moved to focus the telescope on an object 40 meters distant? |
| | A) | 1.6 cm |
| | B) | 81.6 cm |
| | C) | 0 cm |
| | D) | 161.6 cm |
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| 10 | |
An object is located 16.0 cm in front of a converging lens with focal length 12.0 cm. To the right of the converging lens, separated by a distance of 20.0 cm, is a diverging lens of focal length -10.0 cm. Find the location of the final image. |
| | A) | 18.9 cm to the left of the diverging lens |
| | B) | 15.6 cm to the left of the diverging lens |
| | C) | 10.3 cm to the left of the diverging lens |
| | D) | 16.5 cm to the left of the diverging lens |
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