 Again now, Young's composite experiment, thickness T and location of sector maxima, where it is? Other friends, S1 and S2. Sir, we have the formula of the part. Sir, this needs to go down, right? So, this distance, the light... No, it should go down. Tell me, sir. Can I show it to you, sir? Sir, this is a little more like this, and it takes longer time for the light from S1 to S2. See, I think I understand the difference. The remaining distance, there is T. Why? Several great things. Where is it? How do you know this? There are two part difference.