What does it mean when white light is diffracted and at a particular location the color seen is blue

It is because every color is dissapered from your vision but excep blue.

Explanation:

For exaple, if you turn of the light at noght then u will only see black because every color is gone except black.Like that blue appears becasue every color is gone except blue

I hope it did help you!have a nice day!

probably not if net force is zero

365.25 earth days are in the year of a light year