1. The problem statement, all variables and given/known data A source of light is used to illuminate a screen. 1 m from the source, the intensity of the light falling on the screen is 12 000 lux. Calculate the intensity on the screen at distances of: (a) 2 m (b) 3 m (c) 4 m 2. Relevant equations I 1/I 2 = d^2 2/d^2 1 or something 3. The attempt at a solution I don't understand at all. I'm hoping you guys would be able to explain what I am meant to do here because the teacher fails at teaching. Just give me the equation for (a) so that I have a better understanding of what the is going on which would hopefuly enable me to do (b) and (c). Thank you.