Unpolarized light with intensity s is incident on a series of polarizing sheets. the first sheet has its transmission axis oriented at 0°. a second polarizer has its transmission axis oriented at 45° and a third polarizer oriented with its axis at 90°. determine the fraction of light intensity exiting the third sheet with and without the second sheet present.

Explanation:

Given

Initial Intensity of light is S

when an un-polarized light is Passed through a Polarizer then its intensity reduced to half.

When it is passed through a second Polarizer with its transmission axis

here

When it is passed through third Polarizer with its axis to first but to second thus

When middle sheet is absent then Final Intensity will be zero                    

c. newton's third law of motion