In all but very exceptional circumstances, no.
Refractive index is the ratio of speeds.
A solid mass won't travel at the speed of light.A solid mass of any speed can block rays of light from the Sun, if it happens to pass in front of the Sun.A solid mass won't travel at the speed of light.A solid mass of any speed can block rays of light from the Sun, if it happens to pass in front of the Sun.A solid mass won't travel at the speed of light.A solid mass of any speed can block rays of light from the Sun, if it happens to pass in front of the Sun.A solid mass won't travel at the speed of light.A solid mass of any speed can block rays of light from the Sun, if it happens to pass in front of the Sun.
Yes. The speed of light in water is approximately 2/3 the speed of light in air.
Speed=3x10^8 m/s Time=8.3168708 minutes
Of course. You feel completely normal no matter what speed you happen tobe traveling. If you pass other people and they measure you as you pass by,they're the ones who notice weird things. If you pass them at the speed of lightwhile they measure you, they find that your mass is infinite, your front-to-backthickness is zero, and your heart and your wristwatch have stopped.What's even morre weird than that ... if you measure the other people whileyou pass them, you find exactly the same things about them, althougheverybody feels completely normal.And, by the way, if they shine a flashlight at you as you pass, and you shine aflashlight at them, their light passes you at the speed of light, and your lightpasses them at the speed of light.
diffraction
Zero (0) light cannot pass through opaque materials.
Refracting
None. At the speed of light, time stops completely. It is impossible for anything with an invariant mass to move at the speed of light; only particles with no "rest mass" (such as photons) can do so.
Refraction.
refraction
For a start, it is not possible to propel it indefinitely. Where should the energy come from? On the other hand, there is a speed limit in the Universe, called the "speed of light". An object can approach the speed of light, but never quite reach it, much lass pass that speed.