Please help with this physics question.

1. Die figur toon die pad van 'n ligstraal wat die skeidingsvlak vanaf lug na water (3) oorsteek. Die brekingsindeks van water vir hierdie lig is 1,33. Wat is die spoed (in m 60 s"!) van die ligstraal in die water? 30 air/lug The figure shows the path of a light ray as it travels through air and crosses a boundary into water. The index of refraction of water for this light is 1,33. What is the speed (in m s") of this water light ray as it propagates through the water? A. 1,21 x 108 B. 1,95 x 108 C. 2,26 x 1C D. 2,76 x 108 E. 3,00 x 108