Hello
M.Sc Forensic Science is a 2 year post graduation program. The eligiblity criteria is a Bachelors degree in science or equivalent qualification.
The field is rapidly growing in India and offers a lot of  job opportunities.

Admission to this course are based on entrance examination conducted by respective universities. The fees of the course is around 20,000 to 2 Lakh Rs for 2 years course.
Yes, being a B.Sc Physics Hons student, you are eligible for this course.

M.Sc Forensic Science colleges in Kerela are:

• CMS College, Mannam
• MG University, Kottayam
• Central Forensic Science Laboratory
• BAM College, Pamba
• Government Medical College, Trivandrum
• Farook College, Kozhikode
• All Saint College, Thiruvananthapuram

Good luck