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JDK1.0.2 simulations (1996-2001) => Optics => Topic started by: didi on October 17, 2005, 05:07:21 pm



Title: why do we use white paper and black pen ?
Post by: didi on October 17, 2005, 05:07:21 pm
White letters in a black paper, if the all books and news paper are like this would it be easier for us to read or opposite? I think it is definitely very tiring to read.
Why is that?
Black colour reflects very little light but we read the white part.
Are our pupil open wider when the background is black even though the atmosphere is bright?
Anyone has any good answer?


Title: topic282
Post by: Fu-Kwun Hwang on October 18, 2005, 08:19:00 am
We can read white character on black paper easily.  I think our eye will get used to it whatever  was provided.

It is just more difficult to make black paper (which absorpt all the light).


Title: Re: why do we use white paper and black pen ?
Post by: sunilbalani on January 06, 2008, 01:41:04 pm
white colour is a good reflector while black a good absorber. This provides a better contrast.A black sheet in white lit room is certainly more conspicuous than a white sheet in dark room.