Diffraction Grating 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

t5-148

Effect

Computation or source lookup only

Input and validation requirements

A zero grating spacing produces division by zero and must be rejected. The specification also requires an explicit branch for orders with |mλ/d|>1, which have no real diffraction angle, and an explicit sign convention for negative orders.

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": {
    "grating_spacing": {
      "value": 1,
      "unit": "micrometres"
    },
    "wavelength": {
      "value": 500,
      "unit": "nanometres"
    },
    "order": 1
  },
  "expected_outputs": {
    "diffraction_angles_degrees": [
      -30,
      30
    ],
    "maximum_visible_order": 2
  },
  "working": "Convert d: 1.0 micrometre = 1000 nm. Compute sin(theta) = m lambda/d = (1 x 500 nm)/1000 nm = 0.5. Therefore theta = arcsin(0.5) = 30 degrees, giving symmetric angles -30 degrees and +30 degrees. Maximum order = floor(d/lambda) = floor(1000/500) = floor(2) = 2."
}

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