The prosecution case was that Ramesh, a tea estate worker, kidnapped the girl, residing near his house on October 11, 2011, took her to a secluded tea estate and raped her.
Judge (in-charge) G P Elango also imposed a fine of Rs 5000 on Ramesh.
The girl and the mother were contract labourers from Jharkhand and both left for their native place after the incident.