Answer:
1.014 cm
Step-by-step explanation:
Given:
λ=710 nm = [tex]710*10^-9 m[/tex]
[tex]d= 0.21mm=0.21*10^-3 m[/tex]
[tex]D= 2.40m[/tex]
Formula:
[tex]y_{n} =(n D lambda)/d[/tex]
to find the distance between the central maximum and the 3rd maximum
put n=3
substituting the values in formula
[tex]y_{3} =(3)(710*10^-9)/(0.21*10^-3)[/tex]
[tex]y_{3} =0.01014m = 1.014 cm[/tex]