1: Equations

Question 1

Intensity of a wave

Answer 1

I=P/A
I = intensity (W/m^2)
P = Power (W)
A = Area (m^2)

Question 2

Curvature of a wave

Answer 2

Curvature = 1/r

where r = radius (m)

Question 3

Power of a lens

Answer 3

Power = 1/f
where f = focal length (m)
Power (D, dioptre)

Question 4

Refractive Index

Answer 4

n = c/v