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If the two lines l_1:x - 2 \over 3 = y + 1 \over -2,\,z = 2 and l_2:x - 1 \over 1 = 2y + 3 \over α = z + 5 \over 2 are perpendicular, then an angle between the lines l2 and l_3:1 - x \over 3 = 2y - 1 \over - 4 = z \over 4 is : | Watch the step-by-step video solution for this NIMCET PYQ.