[Metrology] How Thick Is A Sliver Of Light

Take a dial, vernier, or electronic caliper and open it to .002". Hold it up so you are looking through the gap at fluorescent lights. Now tilt the calipers gradually to narrow the effective gap, little by little. At some point you will see green light with diffraction patterns in it. Try it, it's pretty cool!

unless your COLOR BLIND AS I AM
 
unless your COLOR BLIND AS I AM

Stay away from electrics...
Although, back in the days of "naughty Export" CB radios, the best local rig doctor was red/green colour-blind - he had a pair of glasses with one red, one green lens, could close up one eye at a time and tell what the resistor colours were...

Dave H. (the other one)
 
I used to play with lasers a little quite a while ago , I forgot most of the terminology but a laser diode dose not have a colored lens , the speed of the light wave is where the color comes from in the human eye.
 
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