Question

A convex lens produces a real image m times the size of the object. What will be the distance of the object from the lens

• A. $\left( \frac { m + 1 } { m } \right) f$
• B. $( m - 1 ) f$
• C. $\left( \frac { m - 1 } { m } \right) f$
• D. $\frac { m + 1 } { f }$

Answer 1

Answer: (A)

$\left( \frac { m + 1 } { m } \right) f$

Answer 2

By using $u = - \left( \frac { m + 1 } { m } \right) \cdot f$