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adjacent
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Homework Statement
The title.
Homework Equations
##y=mx+c##
$$\frac{dy}{dx}(kx^2)=2kx$$
The Attempt at a Solution
https://www.physicsforums.com/attachment.php?attachmentid=69745&stc=1&d=1399976415
I have proved that the angle of reflection will be a° since the angle of incidence=a° The picture will speak for itself.
The red line is the normal,perpendicular to the green tangent.
But how do I prove that it reflects light to the focus, which is (0,0.25)?
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