Physics
When white light passes through a glass prism we get a spectrum on the other side of the prism. In the emergent beam the ray which is deviated least is

The blue ray
The violet ray
The green ray
The red ray

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Physics
The law of conservation of energy states that

Energy can either be created or destroyed
Energy can neither be created or destroyed
Energy can either be created nor destroyed
Energy can neither be created nor destroyed

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