Let the image of the point 
in the line 
, be 
. If 
, is the point on L such that the distance of S from the foot of perpendicular from the point P on L is 
, then 
is equal to :
Text Solution
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Let Q be the point 
from 
to the line
The image of point P in line L is 
∵ Q is the mid-point 
:
comparing 
and 
Direction vector of L is 
vector PQ is 
to 
Now comparing z with 
solving 
and 
Now, any point S on the line L can be written as 
for 
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