Samacheer Kalvi 9th Term I Science Book Back Question and Answers - Unit 3: Samacheer Kalvi 9th Standard New Science Book Back 1 Mark and 2 Mark Question & Answers PDF uploaded and available below. Class 9 New Syllabus 2021 to 2022 Book Back Ques & Ans solutions available for both English and Tamil Medium. Class 9 Science Book Term 1 Unit 3 - Light Answers/Solutions are provided...