Question

What will be the effect on interference fringe if red light is replaced by blue light ?

Answer 1

all depends on the UV rays of the sun

Answer 2

Answer:

The fringe width and interference will decrease if if the red light it is replaced by the blue light from the source. This is because blue light wavelength is lower and its intensity is is low when compared to red light. As the wavelength of the light is directly proportional to the fringe width of the wave.