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IEVref: | 705-05-13 | ID: | |

Language: | en | Status: Standard | |

Term: | refractive modulus | ||

Synonym1: | |||

Synonym2: | |||

Synonym3: | |||

Symbol: | M
| ||

Definition: | one million times the amount by which the modified refractive index exceeds unity: $M={\text{10}}^{\text{6}}\left(n+\frac{h}{a}-\text{1}\right)=N+{\text{10}}^{\text{6}}\frac{h}{a}$
where | ||

Publication date: | 1995-09 | ||

Source: | |||

Replaces: | |||

Internal notes: | 2017-06-02: Cleanup - Remove Attached Image 705-05-13.gif | ||

CO remarks: | |||

TC/SC remarks: | |||

VT remarks: | |||

Domain1: | |||

Domain2: | |||

Domain3: | |||

Domain4: | |||

Domain5: |

$M={\text{10}}^{\text{6}}\left(n+\frac{h}{a}-\text{1}\right)=N+{\text{10}}^{\text{6}}\frac{h}{a}$

where

*n* is the refractive index,

*N* is the refractivity,

*h* is the altitude,

*a* is the radius of the Earth