Question

an object is placed in front of a concave mirror of focal length 30cm image of the object is obtained at a distance 20 cm from the mirror calculate the position of the object ​

Answer 1

Answer:

f= -10

u= +20

1/u-1/v=1/f

1/-20 - 1/v= 1/-10

1/v=1/20

v=20