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What angle should you rotate a mirror so that a reflected ray rotates through 28 degrees.

I got 20, but i am not sure, please help

  • Physics -

    Why 20?

  • Physics -

    If you are facing the mirror, how much do you need to turn the mirror to see things on the left? Go to the bathroom and give it a try.
    The same ratio works for 28°.

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