Light is not PARTICLE !!

     Last time, we talk to the part that public usually agreed the opinion of Newton. But, nowadays we know light shouldn’t regarded as particles. There must be someone who confirmed that light wasn’t particle, and the first guy we will talk about is “Thomas Young”.

 Thomas Young

(http://67.media.tumblr.com/ef4a651642a462781de5bdacbf1be1f3/tumblr_mhlpv7GKA71qig6iso1_500.jpg)

     Thomas Young born at Milverton England and he is a real real real genius. He could speak 10 language when he was only 16, studied medical science when his 19. Although Young was so incredible in different field, we concern on the contribution on physic. When Young was 34 he published a book, in his book there’s a famous experiment “Double-slit experiment”. This experiment trivially showed that light shouldn’t be a kind of particle.But there’s still something wrong with the wave theory.

Double Interference Experiment

(https://en.wikipedia.org/wiki/Double-slit_experiment)

     Augustin Fresnel, engineer from France, gave out a paper of the solve of light diffraction problems using mathematical inference. With the model Fresnel gave there should exist a spot in the middle of the shadow, if we place a light bulb in front of a plat. It sound impossible in the past (it sound quite strange in recent too), but experiment showed that it really pop out a spot!!!!The spot is called Arago spot. There is a misunderstanding about Arago spot, but I’m not going to talk about it.

 Augustin Fresnel

(http://www.sabix.org/bulletin/b37/fresnel.jpg)

     With the events above it’s almost sure that light is a kind of wave, but there’s still some important men we should know, for example “James Clerk Maxwell”.