On 16-5-2019 9:19, IGM wrote:
> "Bald Eagle" <cre### [at] netscape net> wrote:
>> I'm sure everyone has seen this at some point:
>>
>> When you look at a light source's reflection on a smooth piece of glass or metal
>> or plastic, the scratches all tend to appear as a series of arcs and lines
>> roughly in a circular pattern centered around the "hotspot".
>>
>> I was wondering if anyone has ever attempted to replicate this effect, and
>> perhaps has an optical explanation for why the scratches appear in a circular
>> pattern.
>
>
> This effect is the base for "scratch holograms"!! Have a look at
> http://amasci.com/amateur/holohint.html
>
> igmar
>
>
>
LOL This is brilliant!
--
Thomas
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