Questions and Answers
Which of the following statements are correct? (Select all that apply)
The closest object that a typical young person with normal vision can focus on clearly is closest to:
If the lens in a person's eye is too highly curved, this person is suffering from:
Nearsightedness is usually corrected with:
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Farsightedness can usually be corrected with:
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What type of lens is used to make a magnifying glass?
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A simple compound microscope normally uses:
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For relaxed viewing with a microscope or a telescope, the eyepiece is adjusted to place the image at:
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Which one of the following is a characteristic of a compound microscope?
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Which one of the following is normally not a characteristic of a simple two-lens refracting astronomical telescope?
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With what color light would you expect to be able to see the finest detail when using a microscope?
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The resolution of a camera or other optical system is determined by the relationship between what two scales?
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The units of refractive power are ______.
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Accommodation of the eye refers to its ability to __________.
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In the way that a magnifier is usually used, the object is placed __________.
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The magnification of a microscope is increased when __________.
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The fundamental resolution of an optical instrument is set by __________.
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If the back of a person's eye is too close to the lens, this person is suffering from:
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Whose eyeglasses did they use whenever they wanted to start a fire by focusing the sun's rays?
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In a compound microscope:
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You have a choice between two lenses of focal lengths fa and fb, where fb = 2fa, to use as the 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?
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Which one of the following is a characteristic of a compound microscope?
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Which one of the following statements is correct?
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To maximize the magnification of a refracting telescope, what lenses should you choose?
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Chromatic aberration in lenses is due to the:
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Study Notes
Optical Aberrations
- Spherical Aberration: Occurs for lenses; affects image focus.
- Chromatic Aberration: Present in lenses; results from dispersion of light.
Vision and Distance
- Typical young adult can focus clearly on objects as close as 25 cm.
Vision Defects
- Nearsightedness: Caused by overly curved lens; corrected with diverging lenses.
- Farsightedness: Corrected with converging lenses.
Optical Instruments
- Magnifying Glass: Made with converging lenses.
- Compound Microscope: Uses a short focal length objective and longer focal length eyepiece to magnify objects.
- For relaxed viewing, microscopes are adjusted to place the image at infinity.
Image Characteristics
- In a compound microscope, the image formed by the objective is real.
- A simple astronomical telescope produces a virtual image that is typically inverted.
Light and Magnification
- Finest details under a microscope are seen with blue light due to its shorter wavelength.
- Camera resolution is determined by the wavelength of light and size of the aperture.
Eye Accommodation
- Eye accommodation enables focus on both nearby and distant objects.
- Objects for magnifiers are placed at the focal point of the lens.
Magnification Factors
- The focal length of the objective lens affects magnification; decreasing this length increases magnification.
- Magnification in a compound microscope is influenced by the properties of both the objective and eyepiece lenses.
Instruments and Configuration
- To maximize magnification in a refracting telescope, the objective lens should have a large focal length, while the eyepiece should have a small focal length.
Key Terms
- Refractive Power Units: Measured in m-1.
- Chromatic Aberration: Result of dispersion of light by the lens.
Unique Cases
- Farsighted Crusoe and nearsighted Friday could use Crusoe's glasses effectively for starting fires by focusing sunlight.
Studying That Suits You
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Description
Test your knowledge on optical aberrations with these flashcards from Chapter 19. This quiz covers key concepts related to spherical and chromatic aberration in lenses and mirrors. Perfect for students seeking to understand the fundamentals of optics.
