Tuesday, December 15, 2009

Lights!

Hi, was quite busy with lots of stuffs all these days. :)I am back now!

Today I am going to talk about "Optics". Because everyday I get requests to teach lighting in Max/Maya. And I think, to be a good lighting artist, you first need to know what "Light" is. And knowing/study about Light is Optics. Okay, Let's start....

In physics (these days), "Light sometimes is an electromagnetic radiation and sometimes is "particles". "THESE DAYS" because it's definition keeps on changing time to time. Lots of theories comes and goes with their own explanation. "Hindu" theory states that light is one of the 5 elements of which human is made up of. Muslims theory says that "Light" is the method to communicate with god and so on. Read it here http://en.wikipedia.org/wiki/Light

By the way, electromagnetic radiation means... the radiation which boosts up/multiplies/increases/charges when affected with magnet. And Radiation means.. ummmm... let me explain through graphics below.
I hope the above graphics makes you clear. When you throw your hand inside the fire, it's convection. when u get it through something else (such as iron rod) it's Conduction. You get the heat even if you are in distance, it's RADIATION.

From Sun, we get lots of radiations. Few are visible to our eyes and many are not. What ever we see through our eyes is because of the radiation. Let me show you a video from youtube. enjoy this video till I get back... and explain things in detail....



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okay let me make you clear.

Take 4,100 kms long camera reel [ :) too long? assume it,... How far 'd it go from the place where you are right now? :) very far... ya?) Now, listen carefully... assume that within this line lies all types of lights. By types I mean the wavelength/frequency/strength. And, the light which is visible to our naked eyes is just "1" small little frame out of that 4,000 kms long reel. Amazing ya?? This frame is called Visible Spectrum. Name given by Sir Issac Newton. Which is 7 colors as we all know... the Rainbow colors. Red Orange Yellow Green Blue Indigo Violet. Now you may want to know what 'd other invisible lights be? Let me explain with a picture below...

And, the white light is the mixture of the Visible Spectrum (ya! 7 colors). We can also say that light is electromagnetic spectrum from entire radio waves to cosmic rays. Just like Opacity is opposite of transperency, frequency is opposite of wavelength. Like you can see in the pic, Red has the higher wavelength than violet. That means violet has higher frequency than red.

Okay the next chapter would be understanding Frequency and wavelength....

watch the video again to understand how we use light in our daily life. Traffic police uses it to measure the speed of vehicle. Doctors uses it to see which bone is broken, :) (xRay) Mom uses it to cook food for you. it is just soooo amazing... it's not just only about light helps us to see things......

2 comments:

  1. Awesome man.. Thanks for sharing ur research. Its so helpful. Cheers.

    ReplyDelete
  2. Yoo Man .. Brain Start....
    Keep It Up...

    ReplyDelete