Consider light following the path shown. How many phase shifts are there

1
Consider light following the path shown. How
many phase shifts are there?

• 0
• 1
• 2
• 3

2
If l 100 nm, what is the height difference
between green and red?

• 0 nm
• 1 nm
• 100 nm
• 200 nm

3
If you watch a Michelson interference patten
shift by 10 fringes, how much has the mirror
moved?

• 5 wavelengths
• 10 wavelengths
• 20 wavelengths
• None of these