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P is a point on the parabola y^2= 4ax an...

P is a point on the parabola `y^2= 4ax and PQ` is its focal chord. If PT is tangent at P and QN is normal at Q, the angle `alpha`, between `PT and QN` , distance between PT and QN is 'd' then

A

`alpha in (0^(@), 90^(@))`

B

`alpha = 0^(@)`

C

`d =0`

D

`d =a (sqrt (1 + t ^(2))+ (1)/(sqrt (1+ t ^(2)))`

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The correct Answer is:
B
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