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Physics, Chemistry and Biology: Post your doubts here!

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GUYS Mj 2010 v 61, q4!!! i DO NOT GET A THING!! can someone explain~!
EF = Reflecting surface
GH = Normal
JG = Incident ray
GK = Reflected ray

a(i) P3 and P4 are on the reflecting ray , they should be at least 5cm away
a (ii) measure angle between JG and GH
a (iii)measure angle between GK and GH

b ,, i am having a problem there too :(
 
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Thank you so muchh!
and please could you tell me what other diagrams are we responsible to know how to draw?
like the positon of metre rule when measuring v or u?
 
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Guys like in general can We go like from 0-50 for one square but then 50-60 , 60-70 for the other squares . i heard you can do this only if u like cut (zigzag shape) the first square?
 
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