JEE Main 2016 Mathematics question
A ray of light is incident along a line which meets another line at the point . The ray is then reflected from this point along the line . Then the equation of the line of incidence of the ray of light is :
Answer: (3)
Solution
The mirror is the line , and reflection in it maps the reflected ray onto the incident ray. Pick a convenient point on the reflected ray , say , and reflect it in the mirror. With normal and ,
= ,
so the image is
(1,-1) -
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