Question 1183767
the formula to use is y = k/x^2.
y is the intensity.
x is the distance from the light source.
k is the constant of variation.
when x = 1.5, y = 60
the formula becomes 60 = k / 1.5^2
solve for k to get:
k = 60 * 1.5^2 = 135.
when x = 1, the formula becomes:
y = 135 / 1 = 135.
that's the intensity of the light when the light source is 1 feet away.