View in the lab when light pulse arrives from B’

So far so good. The next question asked in the text for problem 20, as our deep thinkers pointed out, is psychology not physics. How much time does the observer in S expect to have elapsed on the clock at A’ during this (75 min) interval?

So far so good. The next question asked in the text for problem 20, as our deep thinkers pointed out, is psychology not physics. How much time does the observer in S expect to have elapsed on the clock at A’ during this (75 min) interval?