Question 203468
{{{1/f=1/o+1/i}}}
where f = focal length, o = object distance, i = image distance
Given, o = 2000000 mm, f = 250 mm.
Substituting these in the given equation
{{{1/250=1/2000000+1/i}}}
{{{1/i=1/2000000 - 1/250}}}
{{{1/i=(1-8000)/2000000}}}
{{{i=-2000000/7999=-250}}} mm (approximately)


P.S.: The minus sign indicates that the object and image are on the opposite sides of the lens.