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Q.

In R3, let L be a straight line passing through the origin. Suppose that all the points on L are at a constant distance from the two planes P1:2xy+z1=0. Let M be the locus of the feet of the perpendicular drawn from the points on L to the plane P1. Which of the following points lie(s) on M?

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a

13,0,23

b

16,13,16

c

0,56,23

d

56,0,16

answer is A, B.

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Detailed Solution

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Line L will be parallel to the line of intersection of P1 and P2 a,b,c are the dr's of line L.

a+2b-c=0, 2a-b+c=0

a:b:c=1:3:5

‘L’ is x01=y03=z05

foot of the perpendicular from origin to the plane P1 is 16,13,16

equation of projection of the line L on plane P1, is x+161=y+263=z165=k

0,56,23 16,13,16 satisfy M

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