Physics
What is refractive index ?

It is defined as the ratio of speed of light in the medium to the speed of light in vacuum.
It is defined as the product of speed of light in medium and in vacuum.
It is defined as the ratio of speed of light in vacuum to the speed of light in the medium.
None of above

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Physics
In heating frozen foods in sealed pouches in a microwaves, why do you first poke holes in the pouch?

To allow the aroma of the food to come out through the holes
To allow the microwaves to get into the food through the holes
To allow the heat to get into the food through the hole
To prevent the steam pressure from bursting open the pouch

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