Deepak Kumar sir (Meritnation Expert),
Sir, you provided me with a weblink for the below question. But, there was no reason available in that answer as per my question. The answer was only in Yes and No.
THIS WAS MY QUESTION:
Explain why it is necessary for the Newton's disk to be rotated very fast (in detail).
(Think if the disc will appear white when rotated very slowly)
{I am this question as I have been taught that the newton's disk will not appear white if it is rotated slowly .}
Dear student
Newton disc rotation experiment is similar to our earth rotation, We know that when we pass sunlight to a prism then it splits into seven colors. But as our earth is rotation very fast the sunlight appears as white. Since all the seven colors combine and our eyes are not able to detect all colors separately. Or in other words when it is rotated fast the colors blend to form white color due to persistence of vision.
White light is a combination of mainly 7 colors.So, Newton wanted to prove this by carrying out this experiment.
Newton disc rotation experiment is similar to our earth rotation, We know that when we pass sunlight to a prism then it splits into seven colors. But as our earth is rotation very fast the sunlight appears as white. Since all the seven colors combine and our eyes are not able to detect all colors separately. Or in other words when it is rotated fast the colors blend to form white color due to persistence of vision.
White light is a combination of mainly 7 colors.So, Newton wanted to prove this by carrying out this experiment.
We see white colour in Newton's disc because of the fact that white light is made up of 7 rainbow colours.
i.e VIBGYOR. And, a Newton disc have parts of different colours. As we rotate our sees the light coming from that colours as combined and it appers white.
Now I a, coming to question
If the speed of the disc is not enough then our eye may detect some combination of colors. Because our eye has some resolution If the speed comes into the range of our eye resolution then oue eye will be able to see colors. In this case the colors are not seen separately but a combination of it.
I think it may help you
Regards