Question

For total internal reflection to occur, all of the following must happen but __________. light must travel slower in the first medium light must refract light must strike the boundary at an angle greater than the critical angle the boundary must be reflective

Answer 1

For total internal reflection to occur, boundary does not need to be reflective

Step-by-step explanation:

There are two conditions for total internal reflection to occur:

1- The light must travel from denser (slower) medium to rarer medium.

2- The light must strike the boundary at an angle, which is greater than the critical angle.

The boundary does not need to be reflective in order for the total internal reflection to occur. In fact, total internal reflection is a phenomenon related to the refraction of light.

Answer 2

Step-by-step explanation:

When a ray of light passes through denser medium to rarer medium and then after refraction it comes back into the denser medium, the phenomenon is called total internal refraction.

There are two necessary conditions for the total internal refraction.

(1) The refraction takes place g=from denser medium to rarer medium.

(2) The angle of incidence in the denser medium should be more than the critical angle for that pair of media.