BITSAT 2016 Paper

Let the co-ordinates of A be (a, 0). Then the slope ofthe reflected ray is

3−0

5−a

=tan‌θ(say)....(1)
Then the slope of the incident ray =‌‌

2−0

1−a

=tan(π−θ) ...(2)
from (1)= and (2) ∵tan‌θ+tan(π−θ)=0
Thus, the co-ordinates of A are (

13

5

,0)