A vertical mirror is placed at the origin. A ray of light coming from A is refle

Question

A vertical mirror is placed at the origin. A ray of light coming from A is reflected by the mirror so that it passes through B. How far from the bottom does the ray hit the mirror? The coordinates are A  =  (10.2, 14.4) and B  =  (16.0, 4.9), in centimetres.

Diagram:

http://www.learning.physics.dal.ca/dalphysicslib/Graphics/Gtype73/mirror.gif

A vertical mirror is placed at the origin. A ray of light coming from A is reflected by the mirror so that it passes through B. How far from the bottom does the ray hit the mirror? The coordinates are A = (10.2, 14.4) and B = (16.0, 4.9), in centimetres.

Explanation / Answer

16*(14.4+4.9)/(10.2+16) =11.786 cm

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