•-Star
A is 5th magnitude, Star B is 0th magnitude, how much brighter is B than A?
•5 – 0
= 2.5 log (IB/IA)
•5/2.5
= 2 = log (IB/IA)
•(IB/IA) = 102 = 100
•-One
star (A) is 1.5 magnitudes brighter than another star (B). What is the intensity ratio?
•Δm = mA – mB =
-1.5 = 2.5xlog(IB/IA)
•-1.5/2.5
= -0.6 = log (IB/IA)
•10-0.6 = IB/IA = 0.251
•IA/IB = 3.98
•