Physics Chapter 26

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  1. 2. A measure of transparency; the ratio of transmitted luminous flux to the incident flux.
  2. 5. A telescope that uses a lens as the principal light-gathering element.
  3. 8. A reflecting telescope having a spherical primary mirror , a convex secondary mirror, a rear-mounted ocular lens, and a front correcting plate that eliminates spherical aberration.
  4. 9. A telescope that uses a mirror as the principal light-gathering element.
  5. 10. The SI unit of light intensity; luminous intensity in a given direction.
  6. 12. Intensity The intrinsic brightness of a ligh source; the power of light energy emitted in a specific direction.
  7. 14. A substance that selectively absorbs certain wavelengths of light; its color is the result of the wavelengths it reflects.
  8. 15. Flux The measure of the total power produced by a light source; weighted power of a light source adjusted to the sensitivity of the human eye for all wavelength emitted.
  9. 16. The amount of light an object receives from a light source; proportional to the intensity of the source and inversely proportional to the square of its distance from the object.
  10. 17. A microscope that has two objectives and two eyepieces, and thus produces a stereoscopic image.
  11. 18. a pair of colors that when combined in the correct proportion produce white light if additive or a very dark grey if subtractive; formed by the combination of two primary colors.
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  1. 1. a semiconductor photoactive surface that converts incident light into voltages, which are then usually digitally coded as picture elements; the heart of digital photographic and video systems
  2. 3. A microscope that uses two of more lenses or groups of lenses to magnify and object.
  3. 4. the rate of light energy reaching a surface in a given direction.
  4. 6. A reflecting telescope where the light incident on the main mirror is reflected by a secondary mirror through a hole in the cengter of the main mirror to the eyepiece located behind the main mirror.
  5. 7. The derived SI unit of luminous flux.
  6. 11. A reflecting telescope that uses a flat secondary mirror to project the image from the main mirror to an eyepiece mounted on the side of the telescope tube
  7. 12. The derived SI unit for illuminance.
  8. 13. An instrument that compares the luminous intensity of an unknown light source to a standard light source.