(a) The irradiance EeE_eEe at the surface
Ee=Ier2=Φ4πr2=1004⋅3.14⋅22≈2E_e=\frac{I_e}{r^2}=\frac{\Phi}{4\pi r^2}=\frac{100}{4\cdot 3.14\cdot 2^2}\approx2Ee=r2Ie=4πr2Φ=4⋅3.14⋅22100≈2 W/m2W/m^2W/m2
(b) The illuminance EvE_vEv at the surface
V(640nm)=0.107V(640 nm)=0.107V(640nm)=0.107
Ev=K(λ)⋅Ee=685⋅V(λ)⋅Ee=685⋅0.107⋅2≈147E_v=K(\lambda)\cdot E_e=685\cdot V( \lambda )\cdot E_e=685\cdot 0.107\cdot 2\approx147Ev=K(λ)⋅Ee=685⋅V(λ)⋅Ee=685⋅0.107⋅2≈147 lxlxlx.
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