Plane Mirror Angle of Reflections

[SaintJude]

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Below is a Kaplan review note pic of how images are formed by plane mirrors. Does theta + theta' = 90? Or does theta = theta'? I think it's the latter, b/c the angle of incidence equals the angle of reflection according to law of reflection, but I'm not sure.

 

[Dasypus]

It's the latter, for exactly the reason you give.

 

[milski]

Also, the way they've drawn the diagram, θ is different from the other θ! 🙄

 

[SaintJude]

Also, the way they've drawn the diagram, θ is different from the other θ! 🙄

Yeah! That's what confused me in the first place....

 

[Dasypus]

If they were nice responsible diagram-drawers, the bottom two would have been θ'' and θ'''. But they weren't.