# The intensity of illumination I from a light varies inversely as the square of the distance d from the light.(a) Write this statement as an equation.(b) Determine the constant of proportionality if it is known that a lamp has an intensity of 1000 candles at a distance of 8 m. (c) What is the intensity of this lamp at a distance of 20 m?

Question

The intensity of illumination I from a light varies inversely as the square of the distance d from the light.
(a) Write this statement as an equation.
(b) Determine the constant of proportionality if it is known that a lamp has an intensity of 1000 candles at a distance of 8 m.

(c) What is the intensity of this lamp at a distance of 20 m?