Physics
The increasing order of the refractive index of certain materials is (left to right) ________

Kerosene, Ice, Benzene, Rock Salt
Rock Salt, Ice, Benzene, Kerosene
Rocksalt, Benzene, Kerosene, Ice
Ice, Kerosene, Benzene, Rock Salt

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Physics
What is the principle of a ''Life Jacket"?

The person can sit on it like a raft
It provides oxygen to a drowning person
It decreases the volume of the person to keep him afloat
It increases the volume of the person to keep him afloat

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