As shown in the figure,three identical polaroids `P_(1),P_(2)` and `P_(3)` are placed one after another.The pass axis of `P_(2)` and `P_(3)` are inclined at angle of `60^(@)` and `90^(@)` with respect to axis of `P_(1)`.The source `S` has an intensity of `256(W)/(m^(2))`.The intensity of light at point `O` is _____`(W)/(m^(2))`

Three identical conducting plates P_(1),P_(2) and P_(3) are kept at a distance d from each other. If q,-q,2q are the charges in P_(1),P_(2) and P_(3) respectively, the electric field between P_(1) and P_(2) is (where A is area of plate)

Unpolarized light is intensity I_(0) passes through two polaroids P_(1) and P_(2) such that pass axis of P_(2) makes an angle theta with the pass axis of P_(1) . A third polaroid P_(3) is placed between P_(1) and P_(2) with pass axis of P_(3) making an angle beta with that of P_(1) . If I_(1), I_(2), I_(3) represent intensities of light trnasmitted by P_(1), P_(2), P_(3) , determine the values of angle theta and beta for which I_(1) = I_(2) = I_(3) .

The polaroids P_(1), P_(2) & P_(3) are arranged coaxially. The angle between P_(1) and P_(2) is 37^(@) . The angle between P_(2) and P_(3) is, if intensity of emerging light is a quarter of intensity of unploarized light

Two Polaroids P_(1) and P_(2) are placed with their axis perpendicular to eachother. Unpolarised light I_(0) is nicident on P_(1) . A third polaroid P_(3) is kept in between P_(1) and P_(2) such that its axis makes an angle 45^(@) with that of P_(1) . The intensity of transmitted light through P_(2) is

A system of three polarizers P_(1),P_(2),P_(3) is set up such that the pass axis of P_(3) is crossed with respect to that of P_(1) . The pass axis of P_(2) is incined at 60^(@) to the pass axis of P_(3) . When a beam of unpolarized light of intensity I_(0) is incident on P_(1) the intensity of light transmitted by the three polarizes is I.The ratio (I_(0)//I) equals (nearly):

Unpolarised light beam of intensity I_(0) is incident on polaroid P_(1) . The three polaroids are arranged in such a way that transmission axis of P_(1) and P_(3) are perpendicular to each other. Angle between the trasmission axis of P_(2) and P_(3) 60^(@) . The intensity of the beam coming out from P_(3) will be: