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Unformatted text preview: (C) A photon of red light carries more energy than a photon of blue light (D) Red light travels through glass at a higher speed than blue light (E) Red light and blue light travel at the same speed in empty space 5. Why do most large telescopes that are currently being designed and built include adaptive optics? (A) It removes distortions caused by the gravitational forces on the large mirror segments. (B) It allows one telescope to observe with multiple focal lengths. (C) It removes distortions caused by the refraction of light in Earth’s turbulent atmosphere (D) It removes chromatic aberration, allowing for sharp images at multiple wavelengths (E) It enables ground based telescopes to observe in the ultraviolet region of the electromagnetic spectrum. 6. How can an astronomer make observations that are free of chromatic aberration? (A) Put their telescope in space. (B) Ensure that the diffraction limit imposed on their telescope is smaller than the “atmospheric seeing” (C) Build a telescope with refractive lenses (D) Build a telescope with reflecting lenses (E) Design their telescope to incorporate “adaptive optics” 7. The Arecibo Observatory in Puerto Rico is the largest “filled aperture” telescope in the worlds with a diameter of 300 meters. It is capable of making observations at wavelengths as small as 30 millimeters. What is the diffraction limite...
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- Spring '08