Physics
It is more difficult to walk on ice than on a concrete road because

There is very little friction between the ice and feet pressing it
There is more friction between the ice and feer
None of these
Ice is soft when compared to concrete

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Physics
'Mirage' is an example of

Refraction and total internal reflection of light
Dispersion of light only
Total internal reflection of light only
Refraction of light 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 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.

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