Question

An object 5 cm tall is placed 1 m from a concave spherical mirror which has a radius of curvature of 20 cm. The height of the image is

• A. 0.11 cm
• B. 0.50 cm
• C. 0.55 cm
• D. 0.60 cm

Answer 1

The correct option is C 0.55 cm

By using $\frac{I}{O}=\frac{f}{f-u}$
Here $O+5cm,f=-\frac{R}{2}=-10cm,u=-1m=-100cm$
So, $\frac{I}{+5}=\frac{-10}{-10-(-100)}\Rightarrow I=-0.55cm$.