Originally posted by alfagal:
quote:
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Originally posted by alfagal:
[b]SPECIAL MYSTERY QUESTION
Why is it that:
When you look at the rose in the day, the petals will look
redder than in the evening.
Now, when you look at the same rose again in evening time, the
stalk appears greener than in
the day.
What is the name of this phenomenon?
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yup this qn is abit hard, needs a lil more research.
CLUE 1: the phenomenon starts with letter 'P'
CLUE 2: the name of this phenomenon coincides with a neuron name in
the cerebellum.
Yes reno got it right. (you can ask
for anything you wan! 
)
Explanation:
Basically, i am jus looking for the name of the phenomenon
The phenomenon is the Purkinje Shift.
Cones are divided mainly into S
M L. Sensitive to Short, Medium and Long
wavelengths (colors: Blue, Green and Red respectively).
In the day, the L cones are more sensitive than the M & S, and
in the evening time, the S are more sensitive than the M & L
cones, therefore a rose would appear redder in the day and the
stalk would appear greener in the evening even though its the same
rose.
During night time, we depend on our rods (detects edges, outlines,
monochromatic vision) more than cones (detects colours,
details),unless you are in a brightly lit area all the time.
Interestingly, we can assume that the amount of activity shifts
from L to S cones during day to evening, hence the Purkinje Shift,
then at night the rods come into play.
Point to ponder:
Some of you might have come across, or experienced them yourself
esp if you are a driver:
Why do they complain every road appears the same at night! but in
the day, it seems alright (so its okie to get lost)
Or:
How come some places appear different during the day and
night?
You will know whats the reason why now.
Anyway:
MYSTERY SOLVED
[/b]
This one very chim. Reflection easier to understand, though I
don't think reflection has anything got to do with this.
