JAMB - Physics (1997 - No. 28)
Light of velocity 3 x 108ms-1 is incident on a material of reflective of index n. If the velocity of light is reduced to 2.4 x 108ms-1 in the material, what is n?
2.33
2.25
1.33
1.25
Εξήγηση
n = \(\frac{3 \times\ 10^8}{2.4 \times\ 10^8}\)
n = 1.25
n = 1.25