Physics
Kirchhoff's laws are applicable to

None of these
C. circuits only
C. and A.C. circuits both
C. circuits only

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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.
None of above
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.

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