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`        A ray of light coming from the point (1,2) is reflected at a point A on the x-axis and then passes through the point (5,3). What are the co-ordinates of point A? `
3 years ago

siddharth gupta
28 Points
```										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).with regardsSIDDHARTH GUPTA
```
3 years ago
Arun Kumar
IIT Delhi
256 Points
```										Hello$\\ tan(\theta)={2 \over 1-x} \\tan(\pi -\theta)={3 \over 5-x}=-tan(\theta)=-{2 \over 1-x} \\3x-3=5-x \\=>4x=8 \\=>x=2$Thanks & RegardsArun KumarBtech, IIT DelhiAskiitians Faculty
```
3 years ago
Harsh
34 Points
```										 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).with regardsHarsh panwar IIT ROORKEEAIR 55
```
2 months ago
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