B$,20\backslash$mu m

source type $,$ Modified Lambertian m$=2$

on axis Radiance $,150($W$)/($c$)$m$^(2)-$sr

source to fiber ambient air

core radius of the fiber $,30\backslash$mu m

fiber type graded index g$=4$r$=0,$ on axis,$0\mathrm{.}15$

a$)$ Predict the power from the source $($in mW$)$

b$)$ Start from appropriate formula given in instructor provided ref sheet $($

showing intermediate details. $)$Predict fraction of power from source that

gets into fiber.

Pf$/$Ps $=$