Physics
Which of the following is used to split white light into different colours ?

Glass slab
Convex lens
Prism
Concave lens

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Physics
Siphon will fail to work if:

The temperature of the liquids in the two vessels are the same.
The densities of the liquid in the two vessels are equal.
Both its limbs are of unequal length.
The level of the liquid in the two vessels are at the same height.

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