what is polarization and what is a polaroid?can u give me a very challenging problem of collision and momentum/ newton's laws of motion?

Hi Aritra,

Polarization (also polarisation) is a property of certain types of waves that describes the orientation of their oscillations. Electromagnetic waves, such as light, and gravitational waves exhibit polarization; acoustic waves (sound waves) in a gas or liquid do not have polarization because the direction of vibration and direction of propagation are the same.

For light, when we cut down the axis of vibration/oscillation of the EM Wave, it is said to be polarised.

Polaroid is one that causes polarisation.

Try this Question: A block of mass m, is kept on a wedge of mass M (that is placed in a frictionless surface). There is no friction between the block and wedge as well. Now find the acceleration of the block, with respect to the ground.

Best Regards,

Ashwin (IIT Madras).