Question

What is lower refrective and higher refractive index?

Answer 1

lower refractive index medium will have more speed of light, i.e., light will travel faster in lower refractive index medium

in higher refractive index medium, light will travel slower

Vacuum-> refractive index=1, speed of light=3 x 10⁸

Diamond-> refractive index=2.42, speed of light=1.24 x 10⁸