AP EAMCET Engineering 17 Sep 2020 Shift 2 Paper

Let point of reflection is (0,y) then, by law of reflection,
Angle of incidence = Angle of reflection
⇒tan‌θ=tan(−θ) { As angles are measured in opposite directions.}
⇒‌‌m1=−m2
⇒‌‌‌

y−3

−2

=‌

y−10

5

⇒‌‌5y−15=−2y+20
⇒‌‌7y=35,y=5
So, point is (0,5).