Free Critical Angle Calculator
Calculate the critical angle for total internal reflection: theta_c = arcsin(n2/n1).
Critical Angle
41.81 °
Critical Angle vs Denser Medium Refractive Index
Critical Angle
The critical angle is the angle of incidence above which total internal reflection occurs when light travels from a denser to a less dense medium.
Formula
theta_c = arcsin(n2 / n1)
where n1 > n2. Above this angle, no light passes through the boundary.
Example Calculation
Light going from glass (n=1.5) to air (n=1).
- 01theta_c = arcsin(n2/n1)
- 02theta_c = arcsin(1/1.5)
- 03theta_c = arcsin(0.667)
- 04theta_c = 41.81°
Frequently Asked Questions
Learn More
Understanding Newton's Laws of Motion
A comprehensive guide to Newton's three laws of motion. Learn about inertia, force and acceleration, action-reaction pairs, and how these principles govern everyday physics.