Maximum safe Glideslope/Localiser deflection.
I'm currently studying for my IMC rating and there is and a little bit of the ILS which I don't understand. I've got the IMC Confuser to help me with my learning and in it there's a question which asks:
'which of these diagrams represents the maximum safe deflection from the glide path'
It has four diagrams all with varying degrees of deflection. My understanding was that the answer is half scale, ie 2.5 divisons of the verticle scale and that is the answer given. However the diagram printed for the right answer shows the glide path bar apparently only 1.5 divisions of the verticle scale. Why is this?