1.

From centre O, of the ellipse (x^2)/(16)+(y^2)/(9)=1, two perpendicular rays are drawn meeting the ellipse at P and Q, N is the foot of perpendicular from O to PQ, then:

Answer»

`(1)/(OP^2)+(1)/(OQ^2)=(25)/(144)`
`(1)/(OP^2)-(1)/(OQ^2)=(25)/(144)`
`ON=(12)/(5)`
`ON=(6)/(5)`

ANSWER :A::C


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