Thursday, March 26, 2020

Indoor #photoassignment :: Chasing a Rainbow of colours

This is a week-long assignment for those confined inside (ie roughly half your self-isolation period). Issac Newton suggested there were seven colours in the spectrum/rainbow of colours he could split daylight into using a glass prism.

They are Red, Orange, Yellow, Green, Blue (a lighter blue a bit closer to cyan) Indigo (a darker blue) & VioletEach day select one colour and find a place or object around your home that is full of that colour. (Hint you might be doing a lot of close ups). The colour need not be vivid it could be a paler or pastel shade it just needs to convey the essence of that colour.

A  lot of modern renditions of the rainbow only show 6 colours. Which colour have they left out?

If you don't have a glass prism handy and want to show the kids how light can be broken into a rainbow of colours. Find an old  CD, DVD or BluRay disk and look at the underside, it has a defraction grating built in which acts like the prism for the laser reading the disk. You will see at least two strong rainbow lines radiating from the center.  The number of line you see will depend on the number of strong light sources in the room. Again how many colour can you see?

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