I. Please solve for the problems below using Snell's law. Please provide solutions

1.A ray of light is incident from air to water at 50.Find the index of refraction of water and its

angle of refraction.

2.Light traveling through an optical fiber (n=1.44) reaches the end of the fiber and exits to air. If the

angle in incidence on the end of the fiber is 30 ^o,what is the angle of refraction outside the fiber?

3. Light travels from air into an optical fiber with an index of refraction of 1.44.If the angle of

incidence on the end of the fiber is 22^o, what is the angle of refraction inside the fiber?

II. link https://www.youtube.com/watch?v=xpcX3B4xE7Q

1. What are the two types of lenses? explain each type

2. How do lenses work? explain

3. Where do we usually used lenses? Give at least 5 uses and explain