Light shine............

Question

Why is it that light can't travel through everything. On my psp there is an orange charging light that when you look at it from a different angle you can see these spikey things coming from it. When i put my hand near it the light shines through. So cant light shine throught everything?

Answer 1

light can be weird although predicting its behavior is pretty easy. think about light reflection off of a lake. you know it can pass through the water but when it strikes the water at a shallow angle, it reflects off. that is how fiber optics work. the laser hits the sides of the fiber at such shallow angles it is reflected back into the fiber. what you are seeing from the side is that side it cant pass through. the spiky things? those must be one of two things. either it is the insides of the LED that you are seeing or the light is a frequency that your eyes cant focus on. if it is the frequency, you will see FUZZY looking light with spikes sticking out of it.  

Answer 2

No there are some objects where light cannot passthrough. One extreme example is a black hole.  

Answer 3

Light can't penetrate through every object,that is why some objects are called opaque an also,when light travels for so long,it loses loads of energy or electrons(as in an element).That is why light from the sun can not travel to other farther planets in the solar system.