I wasn't sure of the latter thing.
Having a weightless particle makes no sense to me.

Light is another thing I do not fucking understand. can't even remember the angle of refraction.
( Lampito rise with the moon, go to bed with the sun, Thu 12 May 2011, 14:24, 2 replies, latest was 15 years ago)

It is dependant on the medum in which the light is being refracted

(Bazongaloid, Thu 12 May 2011, 14:25, Reply)

We had to learn the one for glass, I think.

( Lampito rise with the moon, go to bed with the sun, Thu 12 May 2011, 14:27, Reply)

No one really "understands" light
Debate has raged for hundreds of years over whether it's a wave or a particle, and since some time around 1906 people have grudgingly come to accept that it's some strange amalgamation of the two (i.e., it exhibits some properties of a particle but also some properties of a wave)
(LongJohnBaldry, Thu 12 May 2011, 14:28, Reply)

Yeah, I remember reading that.
The Only thing I really remember is red shift, as at the time I had no idea what it was so drummed it into my head.
( Lampito rise with the moon, go to bed with the sun, Thu 12 May 2011, 14:32, Reply)