Conic Sections Question 423

Question: If the vertex of a parabola be at origin and directrix be $ x+5=0 $ , then its latus rectum is

[RPET 1991]

Options:

5

10

20

40

Show Answer

Answer:

Correct Answer: C

Solution:

$ S\equiv (5,0) $ . Therefore, latus rectum $ =4a=20 $ .

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