Would the effective focal length of mirror be unchanged increase or decreased?

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A concave mirror has a focal length of F when used in the air.  If you use the mirror under water would the effective focal length of the mirror be increased, decreased or unchanged?

Mar 11th, 2015

It would be decreased..........................................................................

Mar 11th, 2015

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Mar 11th, 2015
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Mar 11th, 2015
Oct 22nd, 2017
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