If a few drops of milk are added in the experiment given the reddish colour seen from the front becomes an intense red. However, if many more drops are added the reddish colour is not seen. Why is this so?

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Solution

As more and more milk is added, more particles of protein and fat scatter the light and the blue colour is scattered more and more than orange and red light and the beam appears blue from the sides.

If few drops of milk are added, along with blue colour, orange and yellow also are scattered and only the intense red is seen from the front.

But when many more drops are added, even the red colour is scattered and we do not see any colour from the front.

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