convergence of concave mirror can be decreases by dipping in:-

a.water b.oil c.both(a)and (b) d.none of these

since REFRACTION is not involved in the operation of a mirror and in addition, the laws of REFLECTION are independent of the medium, the answer is (d)

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Focus remains unchanged of a mirror hence the convergence depends upon focus therefore d would be the best answer

Convergence means it is for a concave mirror and it can t be decreased by dipping mirror in Water or oil and it will depend only on / change only if focus of mirror is changed but by dipping it is not affected.So I think D might be the correct answer.Hope this is useful to u😀😀