Question:
A source emits light of wavelength $555 \mathrm{~nm}$ and $600 \mathrm{~nm}$. The radiant flux of the $555 \mathrm{~nm}$ part is $49 \mathrm{~W}$ and of the $600 \mathrm{~nm}$ part is $30 \mathrm{~W}$. The relative luminosity of $600 \mathrm{~nm}$ is $0.6$. Find
(a) the total radiant flux,
(b) the total luminous flux,
(c) the luminous efficiency.
Solution:
