which phasor diagram corresponds to the minimum intensity in the interference pattern?

1
which phasor diagram corresponds to the minimum
intensity in the interference pattern?
2
What is the intensity when the path difference is
????(compared with path difference 0)

• A zero
• B half as much as intensity for zero path
  difference
• C 1/sqrt(2) as much
• D sqrt(2) as much
• E same

3
At a two-slit interference maximum, what is the
intensity compared with what you would get from
ONE SLIT?

• A half as much
• B same as one slit
• C twice as large
• D four times larger
• E 16 times larger

4
For 3 evenly spaced identical slits, what phasor
diagram corresponds to a minimum in intensity?
5
What is the path difference at which this minimum
occurs?

• A ???
• B ???
• C ???
• D ???
• E ?