Refraction Practice 2
10 problems · instant feedback · full explanations
Light bends when its speed changes: n₁sinθ₁ = n₂sinθ₂. Going fast-to-slow bends toward the normal; slow-to-fast bends away.
Q1.
A straw looks bent at the water surface because of:
Multiple choice · Easy
Q2.
Light enters water (n = 1.33) from air at 45° incidence. What is the refraction angle? (degrees)
Numerical answer (°) · Medium
Q3.
What is the critical angle for water (n = 1.33) to air? (degrees)
Numerical answer (°) · Medium
Q4.
Total internal reflection requires:
Multiple choice · Easy
Q5.
In a prism, which color bends the most?
Multiple choice · Medium
Q6.
Light exits water (n = 1.33) to air at 30° incidence in water. What is the angle in air? (degrees)
Numerical answer (°) · Hard
Q7.
Optical fibers guide light using total internal reflection.
True / False · Easy
Q8.
Light changes frequency when it enters a different medium.
True / False · Medium
Q9.
Light travels at 2×10⁸ m/s in a material. What is its refractive index? (c = 3×10⁸ m/s.)
Multiple choice · Hard
Q10.
A highway mirage (wet-looking road) is caused by:
Multiple choice · Hard