Physics
In which one of the following the phenomenon of total internal reflection of light is used ?

Working of binoculars
Formation of rainbow
Formation of mirage
Twinkling of stars

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Physics
A hydrogen balloon floats up because of

Air pressure decreases with decrease in height
Air pressure decreases with decrease in weight
The pressure inside the balloon is more than the pressure outside it
Weight of the balloon is less than the weight of air displaced by it.

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