Let the distance of the point from the bottom of the mirror to the point be x:
We can calculate x from the triangle properties as:
How far below the top edge does the ray strike the mirror?
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Our tutors have indicated that to solve this problem you will need to apply the Ray Nature Of Light concept. You can view video lessons to learn Ray Nature Of Light. Or if you need more Ray Nature Of Light practice, you can also practice Ray Nature Of Light practice problems.