Question

A plastic sun visor allows light to pass through, but reduces the intensity of the light. The intensity is reduced by 5%if the plastic is 1 mm thick. Each additional millimetre of thickness reduces the intensity by another 5%.

Answer 1

Use an equation to model the relation between the thickness
of the plastic and the intensity of the light.
b) How thick is a piece of plastic that reduces the intensity
of the light to 60%?