A Young's double-slit experiment is performed in air and then the apparatus is submerged in water. What happens to the fringe separation, and what can be used to explain the change, if any?
a. The separation decreases because the frequency of the light decreases in the water.
b. The separation decreases because the wavelength of the light decreases in the water.
c. The separation stays the same as it is the same experiment independent of the medium.
d. The separation increases because the wavelength of the light increases in the water.
Question 2
In a Young's double-slit experiment, what happens to the angular separation between the fringes when the wavelength is decreased at the same time that the slit separation is increased?
a. The relative sizes of the changes need to be known before a definite answer can be given.
b. It increases.
c. It decreases.
d. It stays the same.
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