Question

a concave mirror of focal length 20 cm produces an image twice the height of the object, if the image is real ,then the distance of the object from the mirror is 1) 20 cm 2) 10cm 3) 30 cm​

Answer 1

hey mate.....

We know that f=2d

Therefore, the distance of the object from the mirror is 2)10cm

Explanation...... f=2d

20=2d

20/2=d

distance =10cm