1) Why does light bend when it travels from one medium to another?

2) For what incidence angle would light not bend when passing from water to glass?

3) A ray of light is traveling through air at an angle of 30⁰ to the vertical. It passes into water and halves its angle to the vertical. What is the index of refraction of water? Where n_air=1.00

4) A beam of light going through a medium with an index of refraction of 1.14 has an angle of incidence of 48⁰ with another medium. If the light wave is at a new angle of 39⁰, what is the index of refraction for the second medium?