Light of wavelength 610 nm is incident on a slit of width 0.20 mm, and a diffraction pattern is produced on a screen that is 2.0 m from the slit. What is the distance of the second dark fringe from the center of the central bright fringe? (1 nm = 10-9 m)
a. 1.4 cm
c. 0.68 cm
b. 1.2 cm
d. 0.92 cm
B
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Answer the following statement true (T) or false (F)
Which of the following statements about large-scale structure is probably not true?
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The figure above shows the geological time scale of Earth. Animals have been present on land for approximately ________ of the Earth's history.
A) 1/10 B) 1/4 C) 1/2 D) 3/4
How is chromatic aberration corrected in large astronomical reflecting telescopes?
A. a combination of lenses designed to cancel the aberrations B. use a parabolic mirror instead of a spherical mirror C. a properly constructed telescope has no aberration D. change the resolution of the telescope