Question

an object at a distance of 10 cm from a convex mirror of focal length 20 cm find the image distance ???

Answer 1

u=-10cm
f=+20

Using Mirror Formula
1/f=1/v+1/u
1/20=1/v+1/(-10)
1/20=1/v-1/10
1/20+1/10=1/v
1/6.67=1/v
6.67=v