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# Physics GCSE question watch

1. I've been given this homework from my IGCSE Physics textbook (p116 Q1 for those who are wondering )

Draw a ray diagram to show how a ray of light can be turned through 180 degrees using three plane mirrors. Mark on your diagram a value for the angle or i at each of the mirrors.

Basically, I don't even know where to start XD

Thanks
2. (Original post by Elliwhi)
I've been given this homework from my IGCSE Physics textbook (p116 Q1 for those who are wondering )

Draw a ray diagram to show how a ray of light can be turned through 180 degrees using three plane mirrors. Mark on your diagram a value for the angle or i at each of the mirrors.

Basically, I don't even know where to start XD

Thanks
You need to remember that the angle of incidence equals the angle of reflection.

180 degree means it returns in a direction parallel to the way it arrived.

The question asks how would you place three mirrors to do the same thing.

i.e. what angle to the incident ray of light would you place them?

3. (Original post by uberteknik)
You need to remember that the angle of incidence equals the angle of reflection.

180 degree means it returns in a direction parallel to the way it arrived.

The question asks how would you place three mirrors to do the same thing.

i.e. what angle to the incident ray of light would you place them?

Thank you!!! This helps so much :P

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