Drawing normal

[Bomikepa]

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Anyone have tips on how to draw the normal line in these light paths? Ie you have a odd shape and light goes through it and you compare if it's going towards or away from the normal....now I know how to draw a straight line but I can't ever seem to get it 90 degrees it's always a little off....is it just me or what?

 

[krogers21]

Anyone have tips on how to draw the normal line in these light paths? Ie you have a odd shape and light goes through it and you compare if it's going towards or away from the normal....now I know how to draw a straight line but I can't ever seem to get it 90 degrees it's always a little off....is it just me or what?

I don't know how this relates to the MCAT, but I always use a ruler and line up one of the measuring lines/markers with the shape. If its a circle/curve then with the tangent line at the point

 

[Bomikepa]

It's part of the mcat.....and we can't use rulers.

 

[PinknGreenMD]

Anyone have tips on how to draw the normal line in these light paths? Ie you have a odd shape and light goes through it and you compare if it's going towards or away from the normal....now I know how to draw a straight line but I can't ever seem to get it 90 degrees it's always a little off....is it just me or what?

hmmm. what kind of question are you working on ... AAMC practice test or Kaplan or Berkley or what?