Explain why the product of the relative refractive index of medium 1 with respect to…

PHYSICS · Subjective · CBSE · Physics · Light — Reflection and Refraction · Light — Reflection and Refraction

Problem

Explain why the product of the relative refractive index of medium 1 with respect to medium 2 (

n_{12}

) and that of medium 2 with respect to medium 1 (

n_{21}

) is equal to 1.