a point light source is kept
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we know
1/f = 1/u + 1/v
where
u = object distance
v = image distance
here the object is kept at focus
we know when an object is kept at focus the image formed is virtual and object distance is less than image distance
1/40 = - 1/40 + 1/v
1/v = 1/40 + 1/40
1/v = 2/40
1/v = 1/20
v = 20
1/f = 1/u + 1/v
where
u = object distance
v = image distance
here the object is kept at focus
we know when an object is kept at focus the image formed is virtual and object distance is less than image distance
1/40 = - 1/40 + 1/v
1/v = 1/40 + 1/40
1/v = 2/40
1/v = 1/20
v = 20
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