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Question

Find the image of :
(i) (-2,3,4) in the yz- plane.
(ii) (5,2,-7) in the xy-plane.

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Solution

Image of point wrt plane

If a coordinae of a point is represented by (a,b,c) then its image in

xy (say) is given by (a,b,c)
Image of (a,b,c) in xy-plane (a,b,c),,,,(1)
Image of (a,b,c) in yz-plane (a,b,c)....(2)
Image of (a,b,c) in zx-plane (a,b,c)....(3)

(i) Fading image of (2,3,4) in yz plane is given by image of (2,3,4) in yz plane is (2,3,4)
(from (2))

(ii) finding image of (5,2,7) in xy plane is given by image of (5,2,7) in xy plane is (5,2,7)
(from (1))

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