Correct Answer - Option 2 : 6 units
Concept:
Parabola, x2 = 4ay, where a > 0, then
Length of latus rectum = 4a
Parabola, x2 = - 4ay, where a > 0, then
Length of latus rectum = 4a
Calculation:
Given parabolic equation , x2 = - 6y
On comparing with standard equation, a = \(\frac{3}{2}\)
We know that, length of latus rectum = 4a
Latus rectum = 4a
⇒ Latus rectum = 4× \(\frac{3}{2}\)
⇒ Latus rectum = 6 units.
The correct option is 2.