A point object is placed at a distamce of 10 cm anad its real image is formed at a distance of 20 cm from a concave mirror. If the object is moved by 0.1 cm towards the mirror. The image will shift by about

Options

A. 0.4 cm away form the mirror
B. 0.4 cm towards the mirror
C. 0.8 cm away from the mirror
D. 0.8cm towards the mirror

Answer

A

Explanation

`m=-(v/u)=(-20)/(-10)=-21
`| Delta v|=m^(2)| Delta u|`
`=(-2)^(2) (0.1cm)`
=0.4 cm
Object and image travel in opposite direction (along the axis).