A light ray is passed through a beaker having colloid of milk in water and then through a beaker having clear water. What is the colour of light seen on the other end?

White

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Blue

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Red

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Shadow

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Solution

The correct option is C Red
When light ray is passed through a beaker having a colloid of milk, blue light is scattered more than the red and the outcoming light is reddish in colour. A light ray passing through clear water faces no scattering and hence, incident light colour is preserved. Therefore, the final light ray coming out of the two beakers is red.

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