Thread: word prob

The illumination of an object (in lumens) created by a certain light source is given by I = 80/D^2 where D is the distance (in meters) of the object from the light source. Use differentials to approximated the decrease in illumination as the distance from the light source changes from 2 meters to 2.5 meters.

How to do this?

Originally Posted by kwivo

The illumination of an object (in lumens) created by a certain light source is given by I = 80/D^2 where D is the distance (in meters) of the object from the light source. Use differentials to approximated the decrease in illumination as the distance from the light source changes from 2 meters to 2.5 meters.

How to do this?

Hello,

you have:

you get:

To estimate the decrease in illumination it is sufficient to use the following values: