two lines that intersect at 90 degrees are perpendicular
ex +
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when angle of incidence is equal to the brewster's angle, the reflected and refracted rays are perpendicular to each other. show it mathematically.
It has no right angles, so if that is what you mean, no, it is not.
If you mean: y = 4x+2 then the line perpendicular to it will have a slope of -1/4
For two items (Planes, lines, line segments, ect.) to be perpendicular that means that they meet at a 90 degree angle. Perpendicularity is denoted by the ⊥ symbol. For example line AB ⊥ line CD would mean that the line AB would be perpendicular to the line CD.
Not too sure what you mean by hp and vp but in general perpendicular lines meet at right angles which is 90 degrees.