An object is placed at a distance of `f//2` from a convex lens. The image will be

Options

A. at one of the foci, virtual and double its size
B. at `(3f)/(2)` , real and inverted
C. at `2f,m` virtual and erect
D. none of these

Answer

A

Explanation

`(1)/(v)-(1)/(-f//2)=(1)/(f)`
`(1)/(v)=(1)/(f)-(2)/(f)=-(1)/(f)`
Again, `(v)/(u)=(-f)/(-f//2)=2`