Question

A 2 cm high object is placed at a distance of 20 cm from a concave mirror are real image is formed at 40 cm of the mirror calculate focal length​

Answer 1

this is very answer

ok mark as brainleist

Answer 2

ans: focal length =13.33 cm

Explanation:

object distance=-20cm

image distance =-40cm

height of object = 2 cm

To find find length :

1/v +1/u=1/f

1/-40+1/-20=1/f

-1-2/40=1/f

f=-40/3=-13.33cm

Hope it helps