Exam-style question
Try this first
What happens to the speed of light when it enters a denser medium from a less dense medium?.
- A.The speed increases
- B.The speed decreases
- C.The speed remains constant
- D.The speed becomes zero
Model answer
What a good answer should say
- The speed decreases
Explanation
Why this works
When light travels from a less dense medium to a denser medium, its speed decreases due to the change in wave speed at the boundary, which is a fundamental concept of refraction.
Common mistake
No common mistake is linked to this question yet.