Question

The focal length of a concave mirror is f and the distance from the object to the principle focus is x. The ratio of the size of the image to the size of the object is

• A. $\frac { f + x } { f }$
• B. $\frac { f } { x }$
• C. $\sqrt { \frac { f } { x } }$
• D. $\frac { f ^ { 2 } } { x ^ { 2 } }$

Answer 1

Answer: (B)

$\frac { f } { x }$

Answer 2

$\therefore \frac { I } { O } = - \frac { f } { x }$