What information do we get about the nature of light by polarisation?

A particle moving along a straight line reverses its direction of motion once. What can we say about the nature of its acceleration?

A particle moving along a straight line path reverses its direction of motion twice. What can we say about the nature of its acceleration?

What do we get from sea water?

What is light, Give the nature of light.

From where do we get clothes?

Does diffraction of light give information about the nature (transverse or longitudinal) of light waves.