Why dipole moment of H2O greater thna F2O ?

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Let’s draw the structure of both two compounds and then analyses it.

                                

In both H₂O and F₂O the structure is quite the same. In H₂O as O is more electronegative than hydrogen so the resultant bond dipole is towards O, which means both the lone pair and bond pair dipole are acting in the same direction and dipole moment of H₂O is high. In case of F₂O the bond dipole is acting towards fluorine, so in F₂O the lone pair and bond pair dipole are acting in opposition resulting in a low dipole

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