Refraction of light, as it enters from one transparent medium to another, is due to

The bending of light as it passes from one medium to another is called:

When a light ray enters into glass medium from water at an angle of incidence 0°, what would be the angle of refraction?

If a ray of light enters from a rarer medium to a denser medium at zero angle of incidence, it would

Which of the following does not change when light travels from one medium to another?

When a ray of light travels from a denser medium to a rarer medium then