Question

for an object placed at distance 20 cm from concave mirror, the image is formed at same position. what is the focal length??

Answer 1

Answer:

F=10cm

U=20cm

V=20cm

1/f=1/v+1/ u

1/f= 1/20+1/20

1/f= 2/20

1/f=1/10

F=10 CM

Hope this hepls

Step-by-step explanation: