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Collecting light in a funnle -Isaac Physics

Im really confused on part c i have checked old forums on student room but still dont understand the steps to get to the answer please help

https://isaacphysics.org/questions/collecting_light_in_a_funnel?board=e78eeda1-bf42-421e-95b4-dd0e3b6600ec
The way I did it was just working out angles and using sin rule a lot
So you have this diagram:
sin rule.png

then you try to work out h by doing lots of sin rule
so z= ao/4sin45 *sin105
x=z/sin60 *sin75..
etc
(edited 1 month ago)

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