Which of the following statements is true of the angles of incidence and reflection?
a. They are not related
b. They can never be equal
c. They are always equal
d. They add to 90.
Question 2
Film behind a double slit is exposed to light in the following way: First one slit is opened and light is allowed to go through that slit for time t. Then it is closed and the other slit is opened and light is allowed to go through that slit for the same time t. When the film is developed the pattern will be
a. one single slit pattern.
b. two superimposed single slit patterns, their centers displaced from each other by the distance between the two slits.
c. one double slit pattern.
d. two double slit patterns, their centers displaced from each other by the distance between the two slits.
e. random darkening of the film. (no pattern at all)
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