What is the critical angle for total internal reflection when light travels from water (n=1.33) to air (n=1.00)?
Correct Answer: 48.6 degrees
- Step 1: Understand that the critical angle is the angle of incidence above which total internal reflection occurs.
- Step 2: Identify the refractive indices of the two materials: water (n1 = 1.33) and air (n2 = 1.00).
- Step 3: Use the formula for the critical angle: sin(θc) = n2 / n1.
- Step 4: Substitute the values into the formula: sin(θc) = 1.00 / 1.33.
- Step 5: Calculate the value: sin(θc) ≈ 0.7519.
- Step 6: Use the inverse sine function to find θc: θc = sin⁻¹(0.7519).
- Step 7: Calculate θc, which is approximately 48.6 degrees.
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