NEET and AIPMT NEET Physics Wave Optics MCQ Questions Solved


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NEET - 2017

Young's double slit experiment is first performed in air and then in a medium other than air. It is found that 8th bright fringe in the medium lies where 5th dark fringe lies in air. The refractive index of the medium is nearly 

(a)1.25 

(b) 1.59 

(c) 1.69

(d) 1.78 

(d) According to question, 5th fringe in air = 8th bright fringe in the medium 

        2×5-1λD2d=8λDμd

          9λD2d=8λDμd

   92=8μ

   μ=8×29

 Refractive index of the medium.

          μ=169=1.7777=1.78

 

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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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NEET - 2016

The interference pattern is obtained with two coherent light sources of intensity ratio n. In the interference pattern, the ratio Imax-IminImax+Imin will be

(a) nn+1             (b) 2nn+1

(c) nn+12         (d) 2nn+12

  

(b) It is given that l2l1=nl2=nl1

  Ratio of intensites is given by

 lmax-lminlmax+lmin=l2+l12_l2-l12l1+l22+l2-l12

          =l2l1+12-l2l1-12l2l1+12+l2l1-12

=n+12-n-12n+12+n-12=2nn+1

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