What is the far point and near point of the human eye with normal vision?

What is breaking point ?

What is the melting point of ice?

What is the function of iris and pupil in human eye?

What are the point charges?

What is point defect?

What is the angular velocity at any point on the equator so that the body feels weightlessness?

A person needs a lens of power -5.5 dioptres for correcting his distant vision. For correcting his near vision he needs a lens of power +1.5 dioptre. What is the focal length of the lens required for correcting near vision?

What is the distance of the point P(2,3) from the x-axis?