A light ray emerging from the point source placed at P(2, 3) is reflected at a point Q on the y-axis and then passes through the pointR(5, 10) . Coordinates of Q are

If P1 be the reflection of P in y-axis , then  P1≡(−2,3) Equation of line P1R is (y−3)=10−35+2(x+2)                                               ⇒y=x+5 It meets the y-axis at (0, 5) ⇒Q≡(0,5)