Why Our Eyes Speak?

A general statement about speaking of eyes that they never tell a lie .more eyes can tell about a person's intentions .like if anybody is in anger although he never shout but we can know his eyes expression .

i want to know how physics language explain this fact?
which rays are involved there who transmitt the message to next person?
are rays for grief' smile' crying ' etc are different ?
and how these rays are read by our brain?

Answer1:

it has nothing to do with rays. iris in you eye gets dilated and contracted based on your emotions. that is what you are identifying as language of eye

Answer2:

I can make my eyes tell lies.wanna test?

Answer3:

Its an impulse reaction; connected to state of your mind.
Have you ever noticed, Most of the movie (especially the Tele films') ; actors looks at you and not to the person who is infront; the rest looks squint; So does the paranoids
It sets off when you're self conscious, or, semi(sub conscious)