Exam-style question
Try this first
When does total internal reflection occur?.
- A.When light travels from a denser to a less dense medium at an angle greater than the critical angle
- B.When light travels from a less dense to a denser medium
- C.When waves bend around obstacles
- D.When waves pass through a narrow slit
Model answer
What a good answer should say
- When light travels from a denser to a less dense medium at an angle greater than the critical angle
Explanation
Why this works
Total internal reflection is defined as the phenomenon that occurs when light travels from a denser medium to a less dense medium at an angle greater than the critical angle, resulting in all the light being reflected back into the denser medium. This condition applies specifically to the interface between two media with different refractive indices.
In contrast, diffraction involves bending around obstacles, and refraction involves a change in speed at a boundary. Thus, total internal reflection is distinct in its specific conditions related to light and medium density.
Common mistake
No common mistake is linked to this question yet.