Answer:
a) See attachment
b) The pattern converges towards central order
c) Very bright spot at central order and rest is dark and contrast of pattern increases.
Explanation:
b) According to Young's Double slit experiment the following relationship is given:
[tex]wavelength = \frac{x*d}{nL}[/tex]
where,
λ = wavelength of light used (m)
x = distance from central fringe (m)
d = distance between the slits (m)
n = the order of the fringe
L = length from the screen with slits to the viewing screen (m)
Using the formula if we increase the (d) i.e distance between slits we see that (x) distance between fringes decreases and the patterns of bright and dark spots is alternating more frequently.
c) When d is arbitrarily large the x is arbitrarily small.
Hence, the entire pattern converges on to the film in a small space with millions spots of bright and dark spots alternating together to forma big bright spot and contrast of pattern increases.
