Take the lens maker equation and show that a lens which has been turned around (surface 1 becomes 2 and 2 becomes 1 ) has the same focal length
What will be an ideal response?
1/f=(n-1)(1/R1 - 1/R2 ) A sign change occurs when 1 and 2 are exchanged, and the radii themselves change sign because the center of curvature moves to other side of surface. These sign changes cancel each other out and yield the same f.
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The greater amount of substance in a solution is generally called the
a. salt. b. solute. c. molar concentrate. d. solvent.
In the condensation theory of the Moon's origin
a. the Moon broke from a rapidly spinning Earth b. the Earth and its Moon formed from the same cloud of matter c. the Moon formed elsewhere in the solar nebula and was later captured by Earth. d. the Moon formed when a very massive planetesimal smashed into the young Earth.
Sally, who weighs 450 N, stands on a skate board while Roger pushes it forward 13.0 m at constant velocity on a level straight street. He applies a constant 100 N force
a. The work Roger does on the skateboard is 0 J. b. The work Roger does on the skateboard is 1 300 J. c. The work Sally does on the skateboard is 1 300 J. d. The work Sally does on the skateboard is 5 850 J. e. The work Roger does on the skateboard is 5 850 J.
What statement below best describes the behavior of light encountering the objective lens of a refracting telescope?
a. All light is absorbed as it travels through a dense, transparent material. b. White light from astronomical objects is emitted by the lens. c. Light rays are focused to form an image after they pass through the lens. d. Light rays are focused to form an image after they reflect off the lens.