SOLUTION: the illuminance E at a point on a surface is given by the formula E = I/dē where E= illuminance in lux I= luminous intensity of the light source in candelas d= dist

Algebra ->  Numeric Fractions Calculators, Lesson and Practice -> SOLUTION: the illuminance E at a point on a surface is given by the formula E = I/dē where E= illuminance in lux I= luminous intensity of the light source in candelas d= dist      Log On


   

Question 262279: the illuminance E at a point on a surface is given by the formula
E = I/dē
where E= illuminance in lux
I= luminous intensity of the light source in candelas
d= distance in metres
rearrange this formula to make d the subject and find the value of d given that E= 25 lux and I= 100 candelas
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
d^2=I/E
d^2=100/25
d^2=4
d=2 meters