Critical Angle / Total Internal Reflection Calculator implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

t5-140

Effect

Computation or source lookup only

Input and validation requirements

The specification does not define handling for n1 <= n2, out-of-domain asin arguments, or signed incidence angles. Invalid-index inputs can produce undefined results, and retaining a negative incidence sign changes the TIR branch unless an unsigned-from-normal convention is enforced.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "n1": 1.5,
    "n2": 1,
    "incidence_angle_deg": 50
  },
  "expected_outputs": {
    "critical_angle_deg": 41.8103,
    "tir": true
  },
  "working": "n2/n1 = 1.0/1.5 = 0.6666667. θc = asin(0.6666667) = 41.8103°. Compare incidence angle: 50.0° > 41.8103°, so TIR = yes."
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche5/tranche5-results.json