Question

The angle θc is the critical angle. For total internal reflection to occur, the angle of incidence must be __________.

greater than θc

either less than or greater than θc

less than θc

equal to θc

Answer 1

im almost 100% it is A, but just would like to confirm(:

Answer 2

Recall that total internal reflection is where there is basically no specular reflection, or that the incident ray is fully bounced 'off' when it meets a medium boundary..so yes you are right. θi must be greater that θc so that there can be total internal reflection

Answer 3

Yes, that is what i was thinking regarding it being greater. Awesome thanks!

Answer 4

\(\color{#0cbb34}{\text{Originally Posted by}}\) @jennylove
Yes, that is what i was thinking regarding it being greater. Awesome thanks!
\(\color{#0cbb34}{\text{End of Quote}}\)
np and you can use Snell's law to determine if there could be total internal reflection. You need to make sure that the refractive index of the medium with the incident ray is greater than the other refractive index. Also the angle must be greater than the critical angle (:

Answer 5

Oh okay I am getting more familiar with using Snell's Law on reviewing these questions and learning! I will take note of all the information!