Question

if red light is used as compared to Blue Light That free spacing​

Answer 1

Answer:

This is the distance between successive wave crests. Red light has a slightly longer wavelength than blue light. Red light (at one end of the visible spectrum) has a longer wavelength than blue light. ... The animation below is designed to show that red light has a lower frequency than blue light.

Answer 2

Answer:

β=dDλ, i.e., β∝λ; the wavelength of blue light is less than that of red light; hence if red light is replaced by blue light, the fringe width decreases, i.e., fringes come closer.

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