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Grade: 11
        
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? 
4 years ago

Answers : (4)

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 regards
SIDDHARTH GUPTA 
4 years ago
Arun Kumar
IIT Delhi
askIITians Faculty
256 Points
							
Hello
Thanks & Regards
Arun Kumar
Btech, IIT Delhi
Askiitians Faculty
4 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 regards
Harsh panwar 
IIT ROORKEE
AIR 55
10 months ago
Yash sharma
24 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)  Aman bansal AIR1
						
6 months ago
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