Physics
Instrument for measuring blueness of the sky or ocean is called ________

Bathymeter
Cyanometer
Barometer
Ceraunograph

ANSWER DOWNLOAD EXAMIANS APP

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.

ANSWER DOWNLOAD EXAMIANS APP