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Free Snell's law calculator for optics and wave refraction problems. Compute refracted angle, critical angle, and total internal reflection behavior between two media.
Last updated: April 20, 2026
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Refracted angle theta2
25.548°
n1 / n2 ratio
0.7519
Critical angle (if n1 > n2)
Not applicable
Refracted angle is 25.548° using n1 sin(theta1) = n2 sin(theta2).
Equation:
n1 sin(theta1) = n2 sin(theta2)
Equation
n1 sin(theta1) = n2 sin(theta2)
When n1 > n2
theta_c = arcsin(n2/n1)
Condition
sin(theta2) > 1
n1 = 1.00, n2 = 1.33, theta1 = 35°
Refracted angle
25.55°
n1/n2 ratio
0.752
The calculator applies interface refraction rules from geometric optics. It uses refractive indices and incident angle to compute transmitted angle or determine total internal reflection.
n1 sin(theta1) = n2 sin(theta2)theta_c = arcsin(n2/n1) (for n1 > n2)Beyond the critical angle, refraction ceases and total internal reflection occurs.
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