Which of the following correctly relates the relative refractive indices

PHYSICS · Single correct · CBSE · Physics · Light — Reflection and Refraction · Light — Reflection and Refraction

Problem

n_{12}

n_{23}

and

n_{13}

for three successive media 1, 2 and 3? (a)

n_{12}+n_{23}=n_{13}

(b)

\dfrac{1}{n_{12}}+\dfrac{1}{n_{23}}=\dfrac{1}{n_{13}}

(c)

n_{12}n_{23}=n_{13}

(d)

\dfrac{n_{12}}{n_{23}}=n_{13}