Source: https://guthlabs.ai/docs/instruments/malus-s-law-polarization-calculator/implementation/

instrument implementation / implementation-contract

# Malus's Law Polarization Calculator implementation

A source-bound implementation contract for Malus's Law Polarization Calculator; deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## 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**: t5-156

**Effect**: Computation or source lookup only

## Input and validation requirements

The angle unit is unspecified. The input value 60 yields 25% transmission when interpreted as degrees but 90.70904852632809% when interpreted as radians, so the calculator can return a materially wrong result unless the unit convention is explicit or 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": {
    "I0_W_per_m2": 100,
    "theta": 0,
    "angle_unit": "degrees"
  },
  "expected_outputs": {
    "transmitted_intensity_W_per_m2": 100,
    "percent_transmission": 100
  },
  "working": "cos(0°)=1; cos²(0°)=1²=1; I=100×1=100 W/m²; percent=100×100/100=100%."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/malus-s-law-polarization-calculator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/malus-s-law-polarization-calculator/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/malus-s-law-polarization-calculator/qualification/>)

## 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`