Question

plss help to solve this

Answer 1

1.position of candle from his eye is 26cm.the distance b/w eyes and lens is 50cm .the distance between candle and lens is 50-26=24
u=24,v=24.then 1/f=1v-1/u=1/f=1/24-(-1/24)
f=24
2.now ,u=10,f=12
1/12=1/v-(-1/10).
1/12-1/10=1/v.
1/v=-1/60,v=60.