Question

If a concave mirror forms a real image 40 cm from the mirror when the object is placed at a distance of 20cm from its pole find focal length of the mirror

Answer 1

Answer:

U=-20cm

V=-40 cm

1/F=1/v+1/u

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

1/f=-3/40

F=-40/3 cm

Answer 2

Answer:

above is your answer

I hope mark as brainleast