Explain the two situations under which no refraction would occur.

Explain the conditions under which a mirage is seen.

Mention two situations in which Snell's law of refraction fails.

Write two situation when angle of refraction is 90^@ .

The conditions under which transpiration would be most rapid

The conditions under which transpiration would be most rapid are

The conditions under which transpiration would be most rapid are

State the conditions under which total internal reflection occurs. One face of a prism with a refracting angle of 30^(@) is coated with silver. A ray incident on another face at an angle of 45^(@) is refracted and reflected from the silver coated face and retraces its path. Find the refractive index of the material of the prism.

What are two main situations in which earthquakes occur ?

In which one of the following situations a chemical reaction does not occur ?