The outside rearview mirror of modern automobiles is marked with warning 'objects in mirror are closer than they appear'.Such mirrors are

A brick is thrown vertically from an aircraft flying two kilometres above earth.The brick will fall with a 

Newton's laws of motion does not hold good for objects

Which one of the following physical quantities is the same for molecules of all gases at a given temperature?

The focal length of the lens of a normal human eye is

X-rays are