Whats the value of 1,152 btu in joules? (a)1,964,445j(b)1,215,360j(c)2,485, 664j(d)997,875j

In order to make any headway with this one, it might help
to know how many joules there are in one BTU, ya reckon ?

I went and looked it up on line, you're welcome.

       1 BTU  =  1055.06 joules .

So if you happen to have 1,152 BTU of energy,
there are 1055.06 joules in each one of them,
and the total is

                        (1,152 BTU) x (1,055.06 joule/BTU)

                   =          1,215,429.12 joules .

Scanning the choices for anything close, we notice that choice-'b'
is only about 0.006% less than my answer.  So that must be the one
they're fishing for, and they must have used 1055-even for their
conversion factor.

Solutions 

1 BTU  =  1055.06 joules .

To calculate,152 BTU of energy

 We know 1055.06 joules in each one of them

Calculations  = 

                        (1,152 BTU) x (1,055.06 joule/BTU)

                   =          1,215,429.12 joules .

Choice (B) is your answer 

What do you need on

Ray 2 should cross through the focal point on the right side of the lens