Physics Viva Questions Class 12 (2026): CBSE Class 12 practical examinations for the 2026 board exams are being scheduled in many schools during the second half of January 2026, and students are now ...

Light travels at different speeds based on the medium it passes through. For example, in a vacuum, it travels at 3.0 × 10^8 m/s in a straight line. But when directed towards glass, air, diamond, water ...