The slit experiement with a cheap laser pointer?

[dav9]

Hi.

Just wondering if anyone has used one of those cheap laser pointers to see the effect of light spreading out on a screen as you close the narrow slit very narrow making the light spread more & more? Do cheap lasers do it? Too bad they banned them in my country, wanted to see this effect.

 

[Sea Moose]

i do this every morning after eating crumpets for breakfast/

 

[HAL9000]

Hi.

Just wondering if anyone has used one of those cheap laser pointers to see the effect of light spreading out on a screen as you close the narrow slit very narrow making the light spread more & more? Do cheap lasers do it? Too bad they banned them in my country, wanted to see this effect.

What country?

 

[dav9]

Australia, wondering if those little red lasers would be ok? the beam isnt very prefect & the slit apparently is 100th of an inch wide. Which I was told use razor blades.

 

[HAL9000]

Australia, wondering if those little red lasers would be ok? the beam isnt very prefect & the slit apparently is 100th of an inch wide. Which I was told use razor blades.

Hmm not sure. I think the whole point is they have to be pretty thin. Still worth a try.

 

[Brainonska511]

You could buy diffraction gratings that have many slits in various spacings. Then a cheap laser pointer should be alright for the task.

 

[MotF Bane]

Cheap laser should be fine, it'll probably be a monochromatic source, which is most of your criteria.