Question

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

using the equation \[I _{f}=I_{o}(0.95)^t\]
how thick is a piece of plastic that reduces the intensity of light by 60% ?

Answer 1

~10 sheets.

Answer 2

@rsnoob how did you get that?

Answer 3

Make an equation, such as \[I=0.95^s \]
where S is the number of Sheets and I is intensity.

Answer 4

so would it become .60=0.95^x then?

Answer 5

Yes.

Answer 6

If you plug in 10, you should get about 60.

Answer 7

thanks a lot! :)

Answer 8

np.