7.01: Light: Refraction: Basic Theory

What is refraction?

• The bending of a ray of light around an object.

• The bending of a ray of light off a medium.

• The bending of a ray of light as it goes from one medium to another.

• The bending of a ray of light in the middle of a medium.

What is A in the diagram above?

• A = important ray

• A = imminent ray

• A = impedance ray

• A = incident ray

What is C in the diagram above?

• The point of normal

• The point of incidence

• The point of refraction

• The point of reflection

What is B in the diagram above?

• The normal at the point of incidence

• The incident ray at the point of incidence

• The perpendicular at the point of incidence

• The refracted Ray at the point of incidence

What is D in the diagram above?

• The refracted ray

• The reflected ray

• The incident ray

• The normal ray

What is i in the diagram above?

• The incident ray

• The angle of incidence.

• The angle of refraction

• The refracted ray

What is r in the diagram above?

• The angle of reflectance

• The angle of reflection

• The angle of refractance

• The angle of refraction

Which one of these is a correct law of refraction?

• The incident ray, the reflected ray and the normal at the point of incidence all lie in the same plane.

• The imminent ray, the reflected ray and the normal at the point of imminence all lie in the same plane.

• The incident ray, the refracted ray and the normal at the point of incidence all lie in the same plane.

• The incident ray, the normal ray and the refracted ray all lie in the same plane.

Which one of these is the correct formula for Snells' Law? 

•  $\frac{Sin\left(r\right)}{Sin\left(r\right)}=n$  

•  $\frac{Sin\left(i\right)}{Sin\left(r\right)}=\ n$  

•  $\frac{Sin\left(i\right)}{Sin\left(i\right)}\ =\ n$  

•  $\frac{Sin\left(r\right)}{Sin\left(i\right)}\ =\ n$  

What happens when a ray of light is perpendicular to a medium?

(When light hits the medium at 90^o ?)

• All light is reflected back

• No refraction occurs, the light travels straight through the medium.