Time taken by light to cross a glass slab of thickness 4 mm and refractive index 3 is
A. 4 × 10-11 s
B. 2 × 10-11 ns
C. 16 × 10-11 s
D. 8 × 10-10 s
Answer:A
Time taken by light to cross a glass slab of thickness 4 mm and refractive index 3 is
A. 4 × 10-11 s B. 2 × 10-11 ns C. 16 × 10-11 s D. 8 × 10-10 s