A two-slit arrangement with 60.3 ?m separation between the slits is illuminated with 537.0-nm wavelength light. If a viewing screen is located 2.14 m from the slits,
find the distance on the screen from the first dark fringe on one side of the central maximum to the second dark fringe on the other side.
A) 57.2 mm
B) 38.1 mm
C) 76.3 mm
D) 26.9 mm
B
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A) be half. B) double. C) stay the same. D) be four times as great.
Modern mammals are descendants of
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Tan's face is 20 cm in front of a concave shaving mirror. If he observes his image to be twice as big and upright, what is the focal length of the mirror?
A) 10 cm B) -40 cm C) -50 cm D) 40 cm E) 50 cm