The distance from earth surface to moon surface is 3.8x105 km. Calculate areal spread and angular spread for a laser of wavelength 632.8 nm and aperture 0.5 mm when it reaches moon.
Angular Spread, θ=wavelength(λ)Aperture(a)=632.8×10−90.5×10−3\theta=\dfrac{wavelength(\lambda)}{Aperture(a)}=\dfrac{632.8\times10^{-9}}{0.5\times10^{-3}}θ=Aperture(a)wavelength(λ)=0.5×10−3632.8×10−9
θ=1265.6×10−6\theta=1265.6\times10^{-6}θ=1265.6×10−6
Axial spread =d×θ=(3.8×105)×(1265.6×10−6)=480.928=d\times\theta=(3.8\times10^5)\times(1265.6\times10^{-6})=480.928=d×θ=(3.8×105)×(1265.6×10−6)=480.928
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