a*sin(θ)=m*λ

sin(θ)≈tan(θ)=x/l

(a*x)/l≈a*sin(θ)=m*λ

a=0.04⋅10

λ=650⋅10

l=71.0⋅10

m=1

x≈(l*m*λ)/a=((71.0⋅10)*(1)*(650⋅10))/(0.04⋅10)=1.15⋅10=1.15

θ=arctan(x/l)=arctan((1.24⋅10)/(71.0⋅10))=1.75