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Find the length of latus rectum of parabola y2 = - 24x . 
1. 16 units
2. 12 units
3. 6 units
4. 24 units

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Correct Answer - Option 4 : 24 units

Concept: 

Parabola, y2 = 4ax, where a > 0, then  

Length of latus rectum = 4a 

Parabola, y2 = - 4ax, where a > 0, then 

Length of latus rectum = 4a 

Calculation: 

Given parabolic equation , y2 = - 24x 

On comparing with standard equation , a = 6 

We know that , length of latus rectum = 4a

Latus rectum = 4a 

⇒ Latus rectum = 4 × 6  

⇒ Latus rectum = 24 units.

The correct option is 4. 

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