Question
Two vertical parallel mirrors $A$ and $B$ are separated by $10\,cm$. A point object $O$ is placed at a distance of $2\,cm$ from mirror $A$. The distance of the second nearest image behind mirror A from the mirror $A$ is $.........\,cm$




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$(A)$ electric force between the spheres remains unchanged
$(B)$ electric force between the spheres reduces
$(C)$ mass density of the spheres is $840 kg m ^{-3}$
$(D)$ the tension in the strings holding the spheres remains unchanged

