As per the given question,
wavelength of the wave (λ)=439nm
separation between the slit (d)=26μm
width of the interference maxima =20.0 cm
Hence 20/2=10cm
total number of interference maxima (m)=3
Let the initial distance between the slit and the screen is D
now, we know that y=dmλD
D=mλyd=3×439×10−910×10−2×26×10−6=1.97m≃2m
Now, for the second case y=20,
m=3
(d)=26μm
D=mλyd=3×439×10−920×10−2×26×10−6=3.95m≃4m
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