Why is it light with white curtains?

[homer]

I thought Planck's constant was about density i.e. as thick as two short plancks?

I always thought it was a 4 by 2

[Winston001]

Gravity can bend light. That's been proven.

Einstein predicted this and it was proven by the observation of Mercury orbiting from behind the sun. According to Newton, Mercury should have appeared at a certain moment (classical physics) but it was observed early ie. the light rays from the planet were bent by the Sun's gravitational field and astronomers could see it before it actually rounded the Sun. Quantum physics.

The difference between laser and a torch is the way the photons are dispersed. Torch the photons are dispersed randomly hence the spread of light the lazer the photons are parallel to each other and remain that way regardless of distance.

Skyryder

The difference is that a laser projects coherent light where all of the rays are polarised and moving in one direction. No laser is perfect and there is dispersal but they can hit the Moon with a laser and get a reflection.

A torch on the other hand just produces random photons (light) which go their own sweet way except the reflector tries to bounce them in generally the same direction. It works for a short distance.

[Big Dave]

Coz the black absorbed more light on the way through

Wouldn't that be sine?

[Hitcher]

Wouldn't that be sine?

Now you're off on a tangent.