Physics
Parabolic mirrors are used in

Driving mirrors
Car headlights
Shaving mirros
Dentists mirros

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Physics
In the process of magnetisation of a bar

Only the surface of the bar gets magnetised
The entire bulk of the bar gets magnetised
Only the ends of the bar get magnetised
Only some parts of the outer layers of the bar get magnetised

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Physics
What is refractive index ?

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

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