NEET Physics Wave Optics Questions Solved

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NEET - 2017

Two polarids P1 and P2 are placed with their axis perpendicular to each other. Unpolarised light Io is incident on P1. A third polaroid P3 is kept in between P1 and P2 such that its axis makes an angle 45° with that of P1. The intensity of transmitted light through P2

(a)Io2

(b) Io4

(c) Io8

(d) Io16

(c) According to the question 

From the above diagram, Intensity transmitted throughP3 

                       I2=Io2cos245°

          I2=I02×122 I2=Io4

Similarly, intensity transmitted through P2

              I3=I04cos245°    I3Io4×122   I3=Io4×12 I3=Io8

 

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