Physicshard · Past Paper
Light enters from air into water (n=1.33). What is the critical angle for the water-air interface?
A42 degrees
B48.8 degrees
C90 degrees
D30 degrees
✓ Correct Answer: B — 48.8 degrees
sin C = 1/n = 1/1.33 ≈ 0.75. C = arcsin(0.75) ≈ 48.8 degrees.
Share this question
More from Physics
- If the mass of a planet is 4 times Earth and its radius is 2 times Earth, 'g' on that planet is:
- The phenomenon of 'Total Internal Reflection' is used in:
- Which of the following energy transformations takes place in an electric motor?
- If the distance-time graph is a horizontal line parallel to the time axis, the body is:
- The angle between the incident ray and the reflected ray is 80 degrees. What is the angle of incidence?