Optics - plane mirror

1. Oct 9, 2011

logearav

Optics -- plane mirror

1. The problem statement, all variables and given/known data

Revered members,
Kindly see my attachment. I don't understand the role of dotted lines in the diagram. Actually , DA, EC and NB are perpendicular bisectors. In the first place, why should we draw perpendicular bisectors? Can't we solve the problem with incident ray and reflected ray alone? Please help, members.

2. Relevant equations

3. The attempt at a solution
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

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2. Oct 9, 2011

ehild

Re: Optics -- plane mirror

The bisectors help you to draw the reflected ray, as it makes an angle with it equal to that of the incident ray.

ehild

3. Oct 9, 2011

Villyer

Re: Optics -- plane mirror

The perpendicular bisector is just the normal line to the mirror that creates the incident and reflected angles.

In this case I don't think they play a big role. This question seems more conceptual than anything.

4. Oct 9, 2011

logearav

Re: Optics -- plane mirror

Thanks for the replies ehild and Villyer. I got it now.