Question

An object is placed $40\text{cm}$ infront of a concave mirror of focal length $20\text{cm}$. The image formed is

• A. real, inverted and of same size
• B. real, inverted and smaller in size
• C. virtual, erect and larger in size
• D. virtual, erect and smaller in size

Answer 1

The correct option is A real, inverted and of same size

Given $f=20\text{cm}$ for concave mirror
$\Rightarrow R=2f=40\text{cm}$
Since radius of curvature is $40\text{cm}$, and object is placed there. Hence object is at centre of curvature ${}^{\prime }{C}^{\prime }$.

$\Rightarrow$ Image formed will be at ${}^{\prime }{C}^{\prime }$, real, inverted and of same size as that of object.