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A ray of light coming from the pt.(1,2) is reflected at a pt. A on the x-axis and then passes through the pt. (5,3) . The coordinates of point A are

A ray of light coming from the pt.(1,2) is reflected at a pt. A on the x-axis and then passes through the pt. (5,3) . The coordinates of point A are

Grade:11

1 Answers

Arun
25750 Points
6 years ago
 
Assume the x-axis to be a  mirror.
take the image of (1,2) in x-axis i.e(1,-2).
as we know that reflected ray when extended back passes through the image of a point on incident ray i.e reflected ray passes through (1,-2) and (5,3).
...from two point form eqn of refl.ray=5x-4y-13=0.
put y=0 ...point of incidence=(13/5,0).

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