Question

what is the position of the image when an object is placed at a distance of 20 cm from a concave mirror of focal length 20 cm​

Answer 1

Answer:

10 cm is answer

Explanation:

1/f = 1/u + 1/v

1/v = 1/f - 1/u

1/v = 1/20 - (-1/20)

1/v = 1/20 +1/20

1/ v = 2/ 20

1/v = 1/10

v = 10cm