Question

Light with a wavelength of 600 nm travels two different paths to the same point. The lengths of the paths differ by 300 nm what is seen at that point?

Answer 1

At the point where two light paths with 600 nm wavelength and a 300 nm path length difference meet, a dark fringe will appear due to destructive interference.

Step-by-step explanation:

If light with a wavelength of 600 nm travels two different paths to the same point and the paths differ by 300 nm, what you would see at that point depends on the concept of interference, specific to wave optics. In this case, the difference in path length is half a wavelength (since 600 nm is the wavelength). When two waves meet and their path length difference is a multiple of a half wavelength, destructive interference occurs. Since 300 nm is half of 600 nm, the two waves would be out of phase and cancel each other out, leading to dark fringe or a minimum in intensity at that point.