The minimum path difference that will produce a phase difference of 90º for light of wavelength 500 nm is
A)62.5 nm
B)125 nm
C)250 nm
D)375 nm
E)400 nm

Question

Quizplus · Accepted Answer

For two coherent sources of light, the path difference required to produce a phase difference of 90º can be calculated using the formula:

Δx = λ/4

where Δx is the path difference and λ is the wavelength of light.

Substituting the given values, we get:

Δx = λ/4 = 500 nm/4 = 125 nm

Therefore, the minimum path difference that will produce a phase difference of 90º for light of wavelength 500 nm is 125 nm.

Hence, the best choice is B.

The Minimum Path Difference That Will Produce a Phase Difference