Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main201912 Apr 2019Evening ShiftPhysicsWave OpticsActual

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 inclined at 60 o to the pass axis of P 3 . When a beam of unpolarized light of intensity I o is incident on P 1 , the intensity of light transmitted by the three polarizers is I . The ratio I o / I equals (nearly):

Options

  1. A5.33
  2. B16.00
  3. C1.80
  4. D10.67

Correct answer

D. 10.67

Step-by-step solution

The intensity of light coming out of 1st Polaroid will be I 1 = I 0 2 From Malus law I = I 0 cos 2 ⁡ θ From Polaroid 2:     I = I 0 2 cos 2 ⁡ 30 ° = I 0 2 3 2 2 = 3 I 0 8 From Polaroid 3: I = 3 I 0 8 cos 2 ⁡ 60 ° = 3 I 0 8 1 2 2 = 3 I 0 32 Now, I 0 I = 32 3 = 10.67

Practice Wave Optics on Quantrex Academy →

More from Wave Optics

In the List-I, four optical effects are mentioned. The physical phenomena of light which are essential to describe these optical effects are given in List-II. Choose the option whi 2026In a single slit diffraction experiment, a slit of width (0.016 0.002) mm is used to measure the wavelength of a monochromatic light source. In the diffraction pattern, the angular 2026As shown in the figure, a ray AB of unpolarized light enters from water of refractive index n_w = 4/3 into a medium of refractive index n_p = 4/ 3 after passing through a glass pla 2026Some distant star is to be observed by some telescope of diameter of objective lens a , at an angular resolution of 3.0 10⁻⁷ radian. If the wavelength of light from the star reachi 2026In a Young double slit experiment, the wavelength of incident light is 6000 Å, the separation between slits S₁ and S₂ is 5 cm and the distance between slits plane and screen is 50 2026In interference experiment the path difference between two interfering waves at a point A on the screen is /3 , where is the wavelength of these waves, and at another point B the p 2026An unpolarized light of intensity I_o passes through polarizer and then through a certain optically active solution and finally it goes to analyser. If the angle between analyser a 2026The maximum intensity in a Young's double slit experiment is I₀ . Distance between the slits ( d ) is 5 , where is the wavelength of light used. The intensity of the fringe, exactl 2026 Full Wave Optics list All JEE Main PYQs