Physics
Which is an example of Phototropism?

Plant bending toward the light
A venus flytrap capturing a fly
Roots of a plant following water
Roots growing into the soil

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Physics
What is refractive index ?

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.
None of above

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