There is a light experiment where a coloured disk with equal red, blue and green sectors is rotated. As the rotational speed increases the coloured sectors coalesce into a white disk, thus demonstrating that white light may be considered to be the sum of three primary colours.

I tried doing this using modern technology - a coloured disk rotating on a computer screen. It didn't work, no matter how fast the disc notionally rotated. I seemed to be getting a slow  stroboscopic effect rather than coalescence. 

Is this caused by a feature of computer screens? 

Can your voice really be "snatched" away by the wind, or is it just that the sound of the wind covers the sound of your voice. If wind does affect sound waves, can it also affect light?

Whilst studying Mechanics (M1), you often use "light and inextensible" to describe string. So my friend posed a hypothetical question that if you had some string that was 1million light years long with me on one end and him on the other. If he pulled one end how long would it take for the my end to move. I thought it would be instantaneous but my teacher thought different.

If I make a box out of mirrors, then open the box in order to to let light in, then I close the box. Why does light not stay stored in the box?

If you had a telescope of such power that you were able to see across and beyond the edge of the universe and back through it. what would you see if you looked at the earth?  would the image you see be of the past? 

What I mean is, when looking at a TV, the old ones not flat screens, I get light looking as though it is going out of the TV and upwards and also it is coming out of the bottom of the TV.

This also happens when looking at streetlights, kind of like the childrens drawings of the circular Sun and the rectangular beams of light stretching out.

Also, these 'beams' don't go on for too long, can't gauage the distance because it seems to be realative. The light also is the same colour as ones that are on the TV screen.

What makes some objects transparent and some objects opaque. However, if it is to do with optical densities, what actually changes things' optical densities?

It is already possible to stop light in extremely low temperature BEC (Bose- Einstein Condensate) But, if i took say, a space ship and travelled at 300,000 meters per second (The speed of light in a vacuum), relative to Earth, and mounted a light on the back, would the light travelling in the opposite direction to the ship, be travelling at the same speed as the Earth?