Two very flat glass plates, 16 cm long, are in contact at one end and separated by 0.020 mm at the other end.
The space between the plates is occupied by oil with index of refraction 1.45. The refractive index of the glass plates is 1.55. The plates are illuminated at normal incidence with monochromatic light, and fringes are observed. When the monochromatic light has a wavelength of 580 nm, how many bright fringes are visible in the pattern?
A) 60
B) 70
C) 80
D) 90
E) 100
Question 2
Two chemical structures are shown, one of a typical gasoline molecule and the other of a typical motor oil molecule. Which is which?
Base your reasoning not on memorization but rather upon what you know about molecular interactions and the various physical properties of gasoline and motor oil.
A) Structure A represents the gas molecule because there are more bonds to gain energy from, giving it a higher energy content than oil.
B) Structure A represents motor oil, illustrating a molecule with greater induced dipole-induced dipole molecular interactions thus, the molecules are strongly attracted to one another.
C) Structure B represents the oil molecule. Because oil molecules are smaller, they can compact closer together, giving the appearance of a thicker solution than gasoline.
D) Structure B represents crude oil which is processed to generate longer molecules of gasoline to prevent toxic vapors from harming consumers.
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