24.1.5—IR / I0 = (Z1 – Z2)2 / (Z1 + Z2)2 for the intensity reflection coefficient

use IR / I0 = (Z1 – Z2)2 / (Z1 + Z2)2 for the intensity reflection coefficient of a boundary between two media.

Use —ir / i0 = (z1 – z2)2 / (z1 + z2)2 for the intensity reflection coefficient to connect the rule to the data and decision in the question.

This matters because —ir / i0 = (z1 – z2)2 / (z1 + z2)2 for the intensity reflection coefficient determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply —ir / i0 = (z1 – z2)2 / (z1 + z2)2 for the intensity reflection coefficient to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: —IR / I0 = (Z1 – Z2)2 / (Z1 + Z2)2 for the intensity reflection coefficient is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.