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It is called transparent object I think
opaque.
laser beam
you're not actually seeing through water you are seeing the light that passed through the water so if light passes through you call it seeing through
No, light doesn't need a physical medium, like air, to travel. As a matter of fact, light travels the fastest it possibly can, 2.98 * 10^8 meters per second, in a vacuum, like space. If light couldn't travel without a medium, then Earth wouldn't receive any light from the Sun.
It is called transparent object I think
A telephone call travels via two posible methods or both. It can travel over an electrical current via copper wire. It more commonly travels via light through fiber optic cabling.
Normally, the answer to that kind of question would depend on what you call "low".In the case of light, however, probably nobody would call it a 'low' speed, becauseit's physically impossible for anything in creation to travel faster than light in a vacuum. It is possible for things to travel faster than light does in other media, but it's not exactly common, and it's still very much on the "fast" end of the scale.
Electricity, as used by us in such things as our computers and TVs etc, requires a conductor. It is the movement of electrons along that conductor which most people call electricity. This cannot travel through space. However electricity is also a part of and related to the electromagnetic spectrum which can travel through space.
An object through which light cannot pass is known as opaque.
opaque.
laser beam
Diffraction.
you're not actually seeing through water you are seeing the light that passed through the water so if light passes through you call it seeing through
Refraction
Crepuscular rays
No, light doesn't need a physical medium, like air, to travel. As a matter of fact, light travels the fastest it possibly can, 2.98 * 10^8 meters per second, in a vacuum, like space. If light couldn't travel without a medium, then Earth wouldn't receive any light from the Sun.