Actually, it has been proved that light is bent by gravity, so it is impossible to prove that light travels in a straight line.
that light travels in straight lines
Yes shadows prove it because if light travelled in bent lines there would be no shadow.
Light is a lot like water or any other liquid. It will travel where ever it is directed until it hits a solid opaque object.
You can do many, many experiments with the light. I'll just mention few categories:- Reflection of the light - Refraction of the light - Spectrum related experiments - Experiments that prove the wave nature of the light (interference) - Experiments that prove the particle nature of the light - Experiments that measure the speed of the light in space - if small scale, usually using interference etc... You may search on internet for specific experiments, by using the words of the categories mentioned upper, to narrow your search results.
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that light travels in straight lines
Yes shadows prove it because if light travelled in bent lines there would be no shadow.
Light is a lot like water or any other liquid. It will travel where ever it is directed until it hits a solid opaque object.
By experiment.
Simply put, light travels in straight lines. If you want to prove this, look at a beam of light coming from a small torch, or find a tube or hose. You can see through the tube when it's straight, but if it's bent, you can't see anything.
it explains d wave nature of light.
That light was made up of the colors of the spectrum and that light could be bent.
To prove that light travels very quickly, first, you need a flashlight. Because a flashlight is giving off light into a focused circle, it is still light. If you turn on the flashlight, as soon as you hit the switch or button, the circle of light at the other end shining on something appears instantly. You cannot catch the light in motion towards the surface the light is being aimed onto, and because light travels so fast, that is why you cannot see the light between the flashlight and the light on a surface.
An experiment can prove or disprove a hypothesis.
Prove causation
Experiment
The colour of the dis when rotating is white it was an experiment to prove that white light was actually made of different colors and that experiment shows that if you get all the colours moving and spining fast enough it looks as if the light is white