What is the position of the image when object is placed at a distance of 20cm from a concave mirror of focal length 20cm?

Text Solution

`+20` cm`+10` cm`-20` cm`-10` cm

Answer : C

Solution : Here , as per the Cartesian sign convention, Object distance , u = - 20 cm <br> Focal length of the mirror , f = -1 0 cm <br> According to mirror formula <br> `1/u+1/v=1/f:.1/v=1/f-1/u=1/(-10)-1/(-20)` <br> or `1/v=1/(-10) +1/20 =(-2+1)/20=-1/20` <br> or `v=-20cm`

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