An object is placed in front of a concave mirror of radius of curvature `40 cm` at a distance of `10 cm`. Find the position, nature and magnification of the image.

Explanation

`R=-40cm`
`f=-20cm`
`u=-10cm`
`(1)/(v)+(1)/(u)=(1)/(f)`
`(1)/(v)=(-1)/(u)+(1)/(f)=+(1)/(10)+((-1)/(20))`
`v=20cm`
The image will be formed 20 cm to the right of mirror.
`"Magnification m"=-(v)/(u)=-(20)/(-10)=2`