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reflection - At what direction does a ray reflect at a 90 degrees corner? - Physics Stack Exchange

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Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Stack Overflow for Teams has its own domain! You can now access your Teams at stackoverflowteams.com. Teams no longer appear in the left sidebar on stackoverflow.com. Check your email to learn more about these changes. Teams Q&A for work Connect and share knowledge within a single location that is structured and easy to search. Say we pointed a laser that is projected into a 90 ∘ 90 ∘ corner of a mirror made by perpedicular walls. I know that you cant use tangent since a derivative of boundary of mirror would not exist at a corner. But this didn't convince me that a reflection could not exist. So I imagined projecting a incident ray of the same slope as close as possible to the corner. I thought that the ray of incidence would be in the same as the ray of incidence except the reflected ray m

reflection - At what direction does a ray reflect at a 90 degrees corner? - Physics Stack Exchange Stack Internal Knowledge at work Bring the best of human thought and AI automation together at your work. Explore Stack Internal At what direction does a ray reflect at a 90 degrees corner? Ask Question Asked 10 years ago Modified 4 years, 6 months ago Viewed 1k times 6 $\begingroup$ Say we pointed a laser that is projected into a $90^{\circ}$corner of a mirror made by perpedicular walls. I know that you cant use tangent since a derivative of boundary of mirror would not exist at a corner. But th

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