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Physics boffins - the colour an object such as a yellow shirt appears to be what in red light?

3 replies

hmc · 18/01/2015 11:38

Me and dd are confused. We get the basic principle that objects are the colour they are in white light because they absorb some colours of the spectrum but reflect others, but we are a bit flummoxed about what happens in different colour lighting.

DD has had these questions in her homework marked as incorrect, what is correct and why?

Yellow shirt in red light would appear? (she has put black which apparently is wrong)
Yellow shirt in green light would appear? (she has put black which apparently is wrong)
Magenta shorts in yellow light would appear? (again she has opted for black which is wrong)

Cheers, physics just not my thang!

OP posts:
hmc · 18/01/2015 11:43

.

OP posts:
NotDavidTennant · 18/01/2015 11:51

www.physicsclassroom.com/class/light/Lesson-2/Color-Subtraction

The yellow shirt absorbs blue light and reflects red and green light (which is why it looks yellow). So under a red light it will reflect the light and appear red.

Maybe based on that your daughter could work out the other two herself?

hmc · 18/01/2015 13:49

Ah thank you, I geddit! Now to see if dd does Smile

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