A beam of light is traveling inside a solid glass cube that has index of refraction 1.62. It strikes the surface of the cube from the inside. (a) If the cube is in air, at what minimum angle with the normal inside the glass will this light not enter the air at this surface? (b) What would be the minimum angle in part (a) if the cube were immersed in water?

What is physics Physics is the study of fundamental laws of nature. These laws can be expressed as mathematical equations. These laws can appear quite simple, but much complexity can arise from them. In physics we use the SI system for unit labeling Length is measured in meters (m) Mass is measured in kilograms (kg) Time is measured in seconds (s) Length is standardized using the distance traveled by light in a vacuum in 1/299,792,458 of a second Some typical lengths (to 1 significant figure): Diameter of our Galaxy: 8 x 10 2m Radius of the Earth: 6 x 10 6m Length of a Football Field: 1 x 102m Diameter of a CD: 1 x 10 -1m Diameter of a hydrogen atom: 1 x 10 -m0 Diameter of an electron: 3 x 10 -1m One kilogram