Physics
Which of the following statements is true when we see ''rainbow' ?

In light rainfall, we face Sun
The Sun remains behind us and we face raindrops
The sky remains clear and the sun is at lower position in the sky
We face sun and raindrops

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Physics
What is a compound microscope?

A microscope that has two sets of lenses : an occular lens and an eyepiece.
A microscope whose lenses are concave.
A microscope whose lenses are convex.
A microscope that has one lens.

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