Where is the band closer to the copper wire when splitting the wire to measure copper wire diameter? Why is the stripe weaker?
The condition of equal thickness interference is that the thickness of the wave film can not be too large,
The closer the wedge ends to the copper wire, the greater the thickness of the air layer, so the stripes become less clear.
Interference is the most visible only when the thickness of the film and the wavelength of light are not very different.
