Proof That Light Travels In Straight Lines?

Question

Could someone list a few different situations in which it proves light travels in a straight line?
For example: Shadows (the shape of the shadow is the shape of the object).

Answer 1

One lamp and two opaque boards with a small hole in them.



Arrange them so that the boards are separated from each other as well as from the source.



Only when all the three { two holes and the source} are in a straignt line we can see the source through the second hole and hence the conclusion that the light travels in straight line.

-------------------------------------------------------------

The waxing and wanning of moon can be explained .

Eclipses of moon and sun can be explained.

Images formed in plane mirrors can also be explained

During complete darkness we focus the torch light straight to the object to be focussed.

The sun light that enters into the small holes in the roof or windows can be seen to pass in a stright line when smoke or dust particles are presnet in that path.

Answer 2

Mirror reflections and snapshots are sharp, life-like and vivd which is only possible if the light reflected from them isn't being scattered. If the light rays maintain the same relationship as they had when they were reflected off of whatever is being imaged, the image will be sharp like the shadows that you mentioned. Mirror images and snapshots acan be crystal clear.



The direct appearance of an object is an accurate image of that object whenever its light is permitted to go straight. The absence of mirages and shimmering is proof of the straight path that light takes in a still, clear medium without heat currents or other atmospheric affects to distort its path.

Answer 3

Get a laser, there's your proof. Although light doesn't always travel in a straight line. Gravity or going through materials can affect the path of light.

Answer 4

Everything travels in a straight line unless acted upon by another force. That is inertia. Sound may be a wave, but it travels in a straight line.

Answer 5

Well what little I know, very little, according to the principle of equivalence light rays traveling in a gravatational field are curved.

Answer 6

Eclipses, light can't go around corners



I'm doing the exact same thing in my physics class at school lolol

Answer 7

Believed to only interact with the weak nuclear force, uncharged dark matter would be totally transparent to electromagnetic radiation of all frequencies. All observations of dark matter by its gravitational influence support that idea.

Answer 8

what if one candle a cardboard with a hole

arrange to a pattern



the shadow of the candle , instead right side up

but upside down

Answer 9

Bruh

Answer 10

1-reflection

2-lens system(telescope,microscope,...)

3-pin hole camera and pass through

4-shadows

5-rectilinear trans

6-it bends near great mass passing.

7-Michelson-morley experiment(eight side mirror sys)

8-the human eye