1. A ray of light of wavelength 850 nm enters a glass block with refractive index 1.55 at 850 nm. What is the phase velocity of the ray in the glass? ANS: 1.935 x 108 ms-1

Refraction is a change in the direction of light rays when they travel from one medium to another. It is the bending of light when it goes through different media.

Light is considered by many scientists to have dual nature, both particle nature and wave nature. First, Particle nature is one in which we consider a stream of packets of energy called photons. Second, Wave nature is considering light as electromagnetic…

Diamond, the world’s hardest naturally occurring material and mineral known, is a solid form of the element carbon. The atoms are arranged in a crystal structure called diamond cubic. They exist in a huge variety of colours. Also, they are one of the bes…