They are all very different, although all return a similar hash of
arguments.
Here is an example...
def vergence_v
u = (rand(2..6)).round(2)
u_vergence =((1/(u*0.01)).round(2))
p = rand((u_vergence + 0.1) ..(u_vergence + 0.7)).round(2)
v_vergence = (p - u_vergence).round(2)
v = (1/v_vergence).round(2)
question = "A slide is placed #{u} cm to the left of a +#{p} D lens.
At what distance (in meters) will the screen need to be placed to the
right of the lens to have the image be in perfect focus?"
answer = "Answer = #{v} meters"
anno = "Solution:
Use the formula U + P = V.
U = Vergence of light rays from the object entering the lens
P = Power of the lens in diopters
V = Vergence of light rays leaving the lens and forming the image
where u = #{u} cm
P = #{p} D
(1) Solve for V
V = U + P
(2) Solve for U
Since Vergence = 1/distance in meters, we need to convert all
units from centimeters to meters.
u = #{u} cm = #{u} X 0.01 = #{((u)*0.01).round(2)} m
U is negative because it is a real object and light rays DIVERGE
from REAL objects
U = -1.0/#{(u*0.01).round(2)}m =
#{(-1.0/(u*0.01)).round(2)}D
(3) Solve for V
V = U + P = #{(-1.0/(u*0.01)).round(2)}D + #{p}D =
#{((-1.0/(u*0.01)) + p).round(2)}D
(4) Solve for v
v = 1/V = #{(1/v_vergence).round(2)}cm"
formatted = {"question_1" => question, "answer_1" => answer, "anno_1"
=> anno}
end
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