Question

A convex mirror has a focal length f. A real object is placed at a distance f in front of it from the pole produces an image at

• A. Infinity
• B. f
• C. f / 2
• D. 2f

Answer 1

Answer: (C)

f / 2

Answer 2

By using $\frac { 1 } { f } = \frac { 1 } { v } + \frac { 1 } { u }$ ⇒$\frac { 1 } { + f } = \frac { 1 } { v } + \frac { 1 } { ( - f ) } \Rightarrow v = \frac { f } { 2 }$