The reason there are two slits, rather than one, in a Young's experiment is:
A) to increase the intensity
B) one slit is for frequency, the other for wavelength
C) to create a path length difference
D) one slit is for fields, the other is for fields
E) two slits in parallel offer less resistance

Question

The reason there are two slits, rather than one, in a Young's experiment is:
A) to increase the intensity 
B) one slit is for frequency, the other for wavelength 
C) to create a path length difference 
D) one slit is for fields, the other is for fields 
E) two slits in parallel offer less resistance

Quizplus · Accepted Answer

Having two slits creates a path length difference between the two beams of light that pass through the slits, which produces an interference pattern. If there was only one slit, there would not be a path length difference and no interference pattern would be formed. The other answer choices are not relevant to the reason for having two slits in a Young's experiment.

The Reason There Are Two Slits, Rather Than One, in a Young's